add app.features to expose <uses-feature ...> elements to the manifest file, cleanup the XML generated code

lib/motion/project/template/android.rb

@@ -44,7 +44,7 @@ task :build do
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="#{App.config.package}" android:versionCode="#{x=App.config.version_code}" android:versionName="#{App.config.version_name}">
   <uses-sdk android:minSdkVersion="#{App.config.api_version}" android:targetSdkVersion="#{App.config.target_api_version}"/>
 EOS
-  # Application permissions
+  # Application permissions.
   permissions = Array(App.config.permissions)
   if App.config.development?
     # In development mode, we need the INTERNET permission in order to create
@@ -55,6 +55,13 @@ EOS
     permission = "android.permission.#{permission.to_s.upcase}" if permission.is_a?(Symbol)
     android_manifest_txt << <<EOS
   <uses-permission android:name="#{permission}"></uses-permission>
+EOS
+  end
+  # Application features.
+  features = Array(App.config.features)
+  features.each do |feature|
+    android_manifest_txt << <<EOS
+  <uses-feature android:name="#{feature}"></uses-feature>
 EOS
   end
   # Custom manifest entries.
@@ -67,10 +74,10 @@ EOS
   android_manifest_txt << <<EOS
     <activity android:name="#{App.config.main_activity}" android:label="#{App.config.name}">
       <intent-filter>
-                    <action android:name="android.intent.action.MAIN" />
-                    <category android:name="android.intent.category.LAUNCHER" />
-                </intent-filter>
-          </activity>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
 EOS
   # Sub-activities.
   (App.config.sub_activities.uniq - [App.config.main_activity]).each do |activity|
@@ -81,7 +88,7 @@ EOS
 EOS
   end
   android_manifest_txt << <<EOS
-    </application>
+  </application>
 </manifest>
 EOS
   android_manifest = File.join(app_build_dir, 'AndroidManifest.xml')

lib/motion/project/template/android/config.rb

@@ -30,7 +30,7 @@ module Motion; module Project;
     variable :sdk_path, :ndk_path, :avd_config, :package, :main_activity,
       :sub_activities, :api_version, :target_api_version, :arch, :assets_dirs,
       :icon, :logs_components, :version_code, :version_name, :permissions,
-      :application_class
+      :features, :application_class
 
     def initialize(project_dir, build_mode)
       super
@@ -41,6 +41,7 @@ module Motion; module Project;
       @assets_dirs = [File.join(project_dir, 'assets')]
       @vendored_projects = []
       @permissions = []
+      @features = []
       @manifest_entries = {}
       @release_keystore_path = nil
       @release_keystore_alias = nil