v0.1.5 alpha Map release

This release has several elf loader fixes to allow for loading larger files.
The major update is the map app! Only shows contacts ands lets you select a contact for basic info for now.
Maps must be downloaded via wifi and requires a SD card.
They can be pre-cached with the download button which will download all map tiles within the selected area.
Navigation improvements!
WASD are now usable for navigation.
Trackball sensitivity settings in the device settings.