All players in one place

- main, background, popup players now connected via one service, one view, one fragment, one activity and one gesture listener
- playback position is synchronized between players. Easy to switch from one to another
- expandable player at the bottom of the screen with cool animation and additional features like long click to open channel of a video, play/pause/close buttons and swipe down to dismiss
- in-player integrated buttons for opening in browser, playing with Kodi, sharing a video
- better background playback that can be activated in settings. Allows to automatically switch to audio-only mode when going to background and then switching to video-mode when returning to the app.

app/src/main/AndroidManifest.xml

@@ -43,6 +43,14 @@
             </intent-filter>
         </service>
 
+        <service
+                android:name=".player.MainPlayer"
+                android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </service>
+
         <activity
             android:name=".player.BackgroundPlayerActivity"
             android:launchMode="singleTask"