- making oscimap default backend

- added about-screen
- added TreeTile for Tile lookup, dropping that HashMap
- using simple line-shader instead of std-derivatives one,
  about twice as faster here
- use distance calculation from MapRenderer - removing TileScheduler
- no need for MapGeneratorJob, pass MapTile directly to MapWorkers
- added two-finger tap gestures for zoom-in/out
- added tub/tron rendertheme
- started caching for oscimap
- add x/y coordinates to MapPosition, using it in MapRenderer
- create tag hash when needed
- no need for long tile coordinates max zoomlevel 31 should suffice

AndroidManifest.xml

@@ -29,6 +29,7 @@
         </activity>
         <activity android:name=".preferences.EditPreferences" />
         <activity android:name=".filepicker.FilePicker" />
+        <activity android:name=".InfoView" android:theme="@android:style/Theme.NoTitleBar" />
     </application>
 
 </manifest>