Change to loading to levelscreen

Need tests for this sort of thing...
Update GDX, First step using new MAPS api
Moved to class-fields, killed stale comments, extract map

Need better commit discipline
Killing more stale comments, unused imports.
Updating linked libraries...

Not sure if I should continue doing this or gitignore them
Trying to mess with the camera, the final piece
Merging in recent Master changes
Merge remote-tracking branch 'origin/master' into create-screen-static-level
Merge complete, finally =)
Merge branch 'master' of https://github.com/icbat/Tradesong