[retro-gtk] (32 commits) ...Drop unused API_VERSION and ENV_PLUGIN_PATH

[Adrien Plazas <aplazas src gnome org>]

Summary of changes:

  d4efcf5... Rename retro-core.h to retro-core-private.h (*)
  7ea1301... build: Build the VAPI from GIR (*)
  86f66cd... Port DeviceType to C (*)
  8e2cc8d... Port JoypadId to C (*)
  329c056... Port AnalogIndex to C (*)
  cd5c65d... Port AnalogId to C (*)
  d512eac... Port MouseId to C (*)
  6244007... Port LightgunId to C (*)
  f1902ce... Port PointerId to C (*)
  4b8e8d7... Port InputDescriptor to C (*)
  9572177... Port InputDevice to C (*)
  e244c0b... Port VideoFilter to C (*)
  1359af9... Port PixelFormat to C (*)
  bdb3f36... Port CoreView to C (*)
  d6568dc... Port CairoDisplay to C (*)
  f6fc10e... Port PaPlayer to C (*)
  1b91049... Port MemoryType to C (*)
  d420778... Port g_log() to C (*)
  62b71fa... Port ModuleQuery to C (*)
  890093d... Port ModuleIterator to C (*)
  6a193c3... Port CoreDescriptor to C (*)
  e8e701e... Port MainLoop to C (*)
  801a659... Merge InputDeviceManager into Core (*)
  ba33fbc... Merge Rumble into Core and InputDevice (*)
  29b30ef... Drop unused ControllerInfo and ControllerDescription (*)
  d3e1ec6... Port CoreError to C (*)
  87231de... Merge CbError into CoreError (*)
  a128a43... core: Rename init() to boot() (*)
  e0821bc... Port Core to C (*)
  3f4baa7... build: Drop Vala-generated C headers (*)
  5c4dcad... build: Move C files out of subdirs in retro-gtk (*)
  d18a1f0... Drop unused API_VERSION and ENV_PLUGIN_PATH (*)

(*) This commit already existed in another branch; no separate mail sent