Added Planet class and planet creation

Click in game to add a planet. No physics code.
- Added physics
- Added physics
- Added PlanetWorker.java
- Added Physics
- Added Physics
- Removed some debug code
- Added HUD for planets
- Added a "player" that can move and jump
- Added comments
Merge branch 'master' of https://github.com/OtagoOpenSource/GamesRepo.git into PlayerTest2
- "P" now toggles camera being fixed to player