Pinned Game Shortcuts (Android Oreo) (#603)

* Initial changes to add game shortcuts.

* Initial working cut.

* Cleanup and converting strings to resource strings.

* Additional cleanup.

* Removed a blank line

* Changes based on review feedback.

* Forgot to save some changes before commiting...

* Standardized dialogs and tried to fix the dialogs auto-closing when the PCView is already opened.

app/src/main/AndroidManifest.xml

@@ -67,8 +67,9 @@
         </activity>
         <!-- Small hack to support launcher shortcuts without relaunching over and over again when the back button is pressed -->
         <activity
-            android:name=".AppViewShortcutTrampoline"
+            android:name=".ShortcutTrampoline"
             android:noHistory="true"
+            android:exported="true"
             android:resizeableActivity="true"
             android:configChanges="mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|screenLayout|fontScale|uiMode|orientation|screenSize|smallestScreenSize|layoutDirection">
             <meta-data