Hades 0.2

[cyanskies]

Hades 0.2 needs a featureset to support a simple rts game. We don't need campaign, multi-level or mission support

• [ ] level interface updates - changes to system attachment and on_* object lists should happen immediately rather than after the start of the next frame (This is impossible, only some guarantees can be made)
• [ ] editor and level updates
  • [ ] triggers
  • [x] mission editor
  • [x] add/remove levels
  • [ ] player management
  • [ ] mission complete/lost callback support
  • [ ] save/load game with scripts
• [x] player input
• [ ] audio