Major plugins refactor

- Rename window.debugPanel to me.debug.Panel
- Rename window.debugParticlePanel to me.debug.ParticlePanel
- Bump minimum melonJS version to 1.2.0
- Add plugins to jshint! So much badly formatted code had to be fixed...
- Fix some sizing and positioning in Debug Panel
- Fix Polygon rendering in Debug Panel (was not drawing the final edge because the `closed` property has been removed)
- Fix font drawing with sub-pixel positions
- Remove some dead code