-Added player conversion to background and popup players.

-[#919] Fixed custom notification does not trigger unlocking on lockscreen.
-[#947] Fixes player crashing on internet outage, issue partially addressed.
-Fixed main player losing state after destroy while in background.
-Fixed main player controls not hiding automatically after orientation change.
-Fixed dialog uploader not marqueeing when too long.
-Fixed popup permission throwing NPE on BaseList.
-Refactored popup permissions to start in NavigationHelper.
-Extracted hardcoded string for player menus.
-Bump Java version to 1.8.
-Some lambda conversions.

app/src/main/res/values/strings.xml

@@ -124,6 +124,11 @@
 
     <string name="unknown_content">[Unknown]</string>
 
+    <string name="toggle_orientation">Toggle Orientation</string>
+    <string name="switch_to_background">Switch to Background</string>
+    <string name="switch_to_popup">Switch to Popup</string>
+    <string name="switch_to_main">Switch to Main</string>
+
     <!-- error strings -->
     <string name="general_error">Error</string>
     <string name="network_error">Network error</string>