Optimizations and fixes of rare situations

- popup after orientation change had incorrect allowed bounds for swiping
- popup could cause a crash after many quick switches to main player and back
- better method of setting fullscreen/non-fullscreen layout using thumbnail view. Also fixed thumbnail height in fullscreen layout
- global settings observer didn't work when a user closed a service manually via notification because it checked for service existing
- app will now exits from fullscreen mode when the user switches players
- playQueuePanel has visibility "gone" by default (not "invisible") because "invisible" can cause problems

app/src/main/res/layout-large-land/activity_main_player.xml

@@ -53,7 +53,7 @@
         android:layout_alignParentEnd="true"
         android:layout_alignParentRight="true"
         android:layout_height="match_parent"
-        android:visibility="invisible"
+        android:visibility="gone"
         android:background="?attr/queue_background_color"
         tools:visibility="visible">
 

app/src/main/res/layout/activity_main_player.xml

@@ -51,7 +51,7 @@
         android:id="@+id/playQueuePanel"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:visibility="invisible"
+        android:visibility="gone"
         android:background="?attr/queue_background_color"
         tools:visibility="visible">