refactor(core): renamed injectables into appInjector

BREAKING CHANGES

Before:

@Component({injectables: [Type]} class MyCmp{}

After:

@Component({appInjector: [Type]} class MyCmp{}

modules/angular2/test/transform/directive_linker/simple_files/bar.ng_deps.dart

@@ -14,7 +14,7 @@ void initReflector(reflector) {
       'parameters': const [],
       'annotations': const [
         const Component(
-            selector: '[soup]', injectables: const [dep.DependencyComponent])
+            selector: '[soup]', appInjector: const [dep.DependencyComponent])
       ]
     });
 }

modules/angular2/test/transform/directive_linker/simple_files/expected/bar.ng_deps.dart

@@ -15,7 +15,7 @@ void initReflector(reflector) {
       'parameters': const [],
       'annotations': const [
         const Component(
-            selector: '[soup]', injectables: const [dep.DependencyComponent])
+            selector: '[soup]', appInjector: const [dep.DependencyComponent])
       ]
     });
   i0.initReflector(reflector);