meson: Use gnome.compile_schemas()

This causes meson to automatically build the clapper gsettings schemas
and set GSETTINGS_SCHEMA_DIR to the correct location within the devenv.

This means that can now be ran without needing to install it somewhere
using:
    meson devenv -C <builddir>
    clapper
    exit

More devenv overrides should be investigated (such as automatically
adopting the correct directory for translated locales etc.)

Signed-off-by: Florian "sp1rit"​ <sp1rit@disroot.org>

src/bin/clapper-app/data/glib-2.0/schemas/meson.build

@@ -0,0 +1,8 @@
+gnome.compile_schemas(
+  build_by_default: true,
+  depend_files: ['com.github.rafostar.Clapper.gschema.xml']
+)
+
+install_data('com.github.rafostar.Clapper.gschema.xml',
+  install_dir: join_paths(prefix, datadir, 'glib-2.0', 'schemas')
+)

src/bin/clapper-app/data/meson.build

@@ -38,10 +38,8 @@ install_subdir('applications',
 install_subdir('metainfo',
   install_dir: join_paths(prefix, datadir)
 )
-install_subdir('glib-2.0',
-  install_dir: join_paths(prefix, datadir)
-)
 
+subdir('glib-2.0/schemas')
 subdir('dbus-1')
 
 gnome.post_install(