Add applaunchd gRPC API wrapper

Changes:
- Add applaunchd gRPC API wrapper in applauncher directory, clients
  can include AppLauncherClient.h to use it.
- To facilitate generating protobuf and gRPC code with protoc,
  switch from CMake to meson for building.  While the code
  generation can be done in CMake, it is a lot more straightforward
  with meson, and if use of this library continues meson will be
  easier to maintain.

Known issues:
- The behavior of the client implementation here with respect to the
  server side (i.e. applaunchd) going away is currently robust, but
  could stand improvement with some further investigation.  As the
  code stands, starting applications works when applaunchd becomes
  available again, but the streaming status RPC that is tied to
  window activation in the homescreen does not reconnect, and there
  seem to be some things that need to be resolved with respect to
  Qt object connection expiry to do so.  If the Qt demos continue to
  be used in a significant fashion, this may be worth picking up.

Bug-AGL: SPEC-4559

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5cb480d4ce4d1cb944ebfd4114fb305f09f28ea3

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