meta-agl-flutter: update for meta-agl-core changes

Changes:
- Pull in image .bb files instead of .inc files.
- Use agl-image-compositor as the base image for agl-image-flutter.
  instead of the appending done to agl-image-weston and its
  packagegroup previously.
- Rework flutter-gallery systemd unit to work again, and update our
  bbappend to install it as disabled as an option for starting up
  flutter-gallery in agl-image-flutter.  It seems useful to keep it
  present to serve as an example of starting Flutter apps via
  systemd and using the agl-flutter-env package.
- Some minor documentation updates in README.md.
- Replace some :append usage with += to avoid creating problems
  for downstream users.

Bug-AGL: SPEC-4813

Change-Id: I8a61d6365ce69ac50b88abc7bc451486b3e1b339
Signed-off-by: Scott Murray <scott.murray@konsulko.com>

2 files changed, 5 insertions, 13 deletions

diff --git a/meta-agl-flutter/recipes-platform/images/agl-image-flutter.bb b/meta-agl-flutter/recipes-platform/images/agl-image-flutter.bb
index 37b0f4e6..8263c0ae 100644
--- a/meta-agl-flutter/recipes-platform/images/agl-image-flutter.bb
+++ b/meta-agl-flutter/recipes-platform/images/agl-image-flutter.bb
@@ -1,10 +1,11 @@
-SUMMARY = "Baseline Flutter Image for Development"
+require recipes-platform/images/agl-image-compositor.bb
 
+SUMMARY = "Baseline Flutter Image for Development"
 LICENSE = "MIT"
 
-require agl-image-flutter.inc
+CLANGSDK = "1"
 
-IMAGE_INSTALL:append = "\
+IMAGE_INSTALL += "\
     weston-ini-conf-landscape \
     \
     flutter-auto-with-logging \
@@ -17,6 +18,6 @@ IMAGE_INSTALL:append = "\
     \
     "
 
-IMAGE_FEATURES:append = "\
+IMAGE_FEATURES += "\
     ssh-server-openssh \
     "
diff --git a/meta-agl-flutter/recipes-platform/images/agl-image-flutter.inc b/meta-agl-flutter/recipes-platform/images/agl-image-flutter.inc
deleted file mode 100644
index defa5d27..00000000
--- a/meta-agl-flutter/recipes-platform/images/agl-image-flutter.inc
+++ /dev/null
@@ -1,9 +0,0 @@
-require recipes-platform/images/agl-image-weston.inc
-
-IMAGE_INSTALL:append = "\
-    agl-compositor \
-    agl-compositor-init \
-    packagegroup-agl-profile-graphical \
-    "
-
-CLANGSDK = "1"