Remove minimap and tilesourcefactory. Fixes #163
Remove createMarker, IMapView.
Simplifications

* Remove ui zoom buttons, rename setZoomLevel to setZoom, add javadocs
* Simplify MapTileDownloader
* Simplify LRUMapCache and add javadocs
* Remove archivefilefactory
* Remove MathConstants
Remove last bits of bloat in map. Fixes #130
Use OkHttp. Fixes #164