0.2.8

new stuff:

- Fixed a bug where Boss Rush wins would override a character's Danger progression. Boss Rush progression is now separate
- Ink Sniper jumps less often, moves slower during phase 2 and faster during phase 3. Ink shots effect modified.
- Halved the spawning of tree and loot aliens
- Fixed minor bugs happening after the special boss is dead
- Added a small hitbox on the UFO Boss when it falls to allow bull to get hit