b2520 changelog (11/15)

Quite insignificant update which is mostly related to controls and user-generated content.

Changes:
- Online resourcepack browser
- Volume controls
* It allows to swap weapons and use character's special ability with volume buttons on your device. Much more convenience for two finger players, though it has a little delay caused by API layer.
- Much better performance
- Smoother and more flexible controls
- Reduced game's size (170mb -> 120mb)
- New resourcepack features
- More clear save deletion sequence
- Fixed Big Bandit not always spawning
- Bunch of other bug fixes and changes