Replaced state cacher with gsettings

data/meson.build

@@ -0,0 +1,10 @@
+install_data('org.erikreider.swaync.gschema.xml',
+  install_dir: join_paths(get_option('datadir'), 'glib-2.0/schemas')
+)
+
+compile_schemas = find_program('glib-compile-schemas', required: false)
+if compile_schemas.found()
+  test('Validate schema file', compile_schemas,
+    args: ['--strict', '--dry-run', meson.current_source_dir()]
+  )
+endif