Rework to use KUKSA.val databroker gRPC API

Rework to move from the WebSocket API with the older KUKSA.val
server to the gRPC "VAL" API of the databroker.

Changes include:
- All VISS WebSocket API code has been removed, and the signal
  providers replumbed to be driven by a new VssClient class with
  a dashboard-specific child class to hold all the gRPC API
  handling.
- The generated code for the VAL API and its dependencies has
  been checked in under lib/generated, as there still does not
  seem to be a good way to generate it during the Flutter build.
- The configuration file is now expected to be "dashboard.yaml"
  instead of "dashboard.yaml".  The authorization token
  field name has been renamed to "authorization", and there are
  new "use-tls" and "ca-certificate" configuration fields.  TLS
  is disabled by default for now, and the default CA certificate
  is /etc/kuksa.val/CA.pem.
- Bumped minimum SDK version to 2.18 in pubspec.yaml to enable
  "super" keyword support.  This matches what the version was set
  to in flutter-homescreen.
- Removed .dart_tool generated output that had been checked in,
  and added .gitignore file from flutter-homescreen so that things
  will hopefully stay clean in the future.

Bug-AGL: SPEC-4762

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ie23091b759458b5a131bc2d85e62925238839166

3 files changed, 111 insertions, 0 deletions

diff --git a/lib/generated/google/protobuf/timestamp.pb.dart b/lib/generated/google/protobuf/timestamp.pb.dart
new file mode 100644
index 0000000..ca4a49a
--- /dev/null
+++ b/lib/generated/google/protobuf/timestamp.pb.dart
@@ -0,0 +1,83 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,constant_identifier_names,directives_ordering,library_prefixes,non_constant_identifier_names,prefer_final_fields,return_of_invalid_type,unnecessary_const,unnecessary_import,unnecessary_this,unused_import,unused_shown_name
+
+import 'dart:core' as $core;
+
+import 'package:fixnum/fixnum.dart' as $fixnum;
+import 'package:protobuf/protobuf.dart' as $pb;
+
+import 'package:protobuf/src/protobuf/mixins/well_known.dart' as $mixin;
+
+class Timestamp extends $pb.GeneratedMessage with $mixin.TimestampMixin {
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'Timestamp', package: const $pb.PackageName(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'google.protobuf'), createEmptyInstance: create, toProto3Json: $mixin.TimestampMixin.toProto3JsonHelper, fromProto3Json: $mixin.TimestampMixin.fromProto3JsonHelper)
+    ..aInt64(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'seconds')
+    ..a<$core.int>(2, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'nanos', $pb.PbFieldType.O3)
+    ..hasRequiredFields = false
+  ;
+
+  Timestamp._() : super();
+  factory Timestamp({
+    $fixnum.Int64? seconds,
+    $core.int? nanos,
+  }) {
+    final _result = create();
+    if (seconds != null) {
+      _result.seconds = seconds;
+    }
+    if (nanos != null) {
+      _result.nanos = nanos;
+    }
+    return _result;
+  }
+  factory Timestamp.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory Timestamp.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  Timestamp clone() => Timestamp()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  Timestamp copyWith(void Function(Timestamp) updates) => super.copyWith((message) => updates(message as Timestamp)) as Timestamp; // ignore: deprecated_member_use
+  $pb.BuilderInfo get info_ => _i;
+  @$core.pragma('dart2js:noInline')
+  static Timestamp create() => Timestamp._();
+  Timestamp createEmptyInstance() => create();
+  static $pb.PbList<Timestamp> createRepeated() => $pb.PbList<Timestamp>();
+  @$core.pragma('dart2js:noInline')
+  static Timestamp getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Timestamp>(create);
+  static Timestamp? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $fixnum.Int64 get seconds => $_getI64(0);
+  @$pb.TagNumber(1)
+  set seconds($fixnum.Int64 v) { $_setInt64(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSeconds() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSeconds() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.int get nanos => $_getIZ(1);
+  @$pb.TagNumber(2)
+  set nanos($core.int v) { $_setSignedInt32(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasNanos() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearNanos() => clearField(2);
+  /// Creates a new instance from [dateTime].
+  ///
+  /// Time zone information will not be preserved.
+  static Timestamp fromDateTime($core.DateTime dateTime) {
+    final result = create();
+    $mixin.TimestampMixin.setFromDateTime(result, dateTime);
+    return result;
+  }
+}
+
diff --git a/lib/generated/google/protobuf/timestamp.pbenum.dart b/lib/generated/google/protobuf/timestamp.pbenum.dart
new file mode 100644
index 0000000..9d127fd
--- /dev/null
+++ b/lib/generated/google/protobuf/timestamp.pbenum.dart
@@ -0,0 +1,7 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,constant_identifier_names,directives_ordering,library_prefixes,non_constant_identifier_names,prefer_final_fields,return_of_invalid_type,unnecessary_const,unnecessary_import,unnecessary_this,unused_import,unused_shown_name
+
diff --git a/lib/generated/google/protobuf/timestamp.pbjson.dart b/lib/generated/google/protobuf/timestamp.pbjson.dart
new file mode 100644
index 0000000..421f785
--- /dev/null
+++ b/lib/generated/google/protobuf/timestamp.pbjson.dart
@@ -0,0 +1,21 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,constant_identifier_names,deprecated_member_use_from_same_package,directives_ordering,library_prefixes,non_constant_identifier_names,prefer_final_fields,return_of_invalid_type,unnecessary_const,unnecessary_import,unnecessary_this,unused_import,unused_shown_name
+
+import 'dart:core' as $core;
+import 'dart:convert' as $convert;
+import 'dart:typed_data' as $typed_data;
+@$core.Deprecated('Use timestampDescriptor instead')
+const Timestamp$json = const {
+  '1': 'Timestamp',
+  '2': const [
+    const {'1': 'seconds', '3': 1, '4': 1, '5': 3, '10': 'seconds'},
+    const {'1': 'nanos', '3': 2, '4': 1, '5': 5, '10': 'nanos'},
+  ],
+};
+
+/// Descriptor for `Timestamp`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List timestampDescriptor = $convert.base64Decode('CglUaW1lc3RhbXASGAoHc2Vjb25kcxgBIAEoA1IHc2Vjb25kcxIUCgVuYW5vcxgCIAEoBVIFbmFub3M=');