[Feature #71] Generic chunks created, working for HP bar only

These chunks work with velocity and acceleration in px/s now.
[Feature #71] Rabbit chunks implemented in Sandbox.
[Feature #95] Sandbox: Rabbit gibs thrown depending on the slice vector
[Feature #95] Rabbit chunks follow the slice cut angle in game.
[Bug] Fixed: Error occurs in the console when starting a slice outside
window

It happens only in the simulator, but it was annoying.
[Feature #95] Rabbits gibs direction improved.
[Feature #71] Blood added back on rabbit death.
[Refactoring] Splash renamed to DogFx and code refactored.
[Feature #71] RabbitFx file created.
[Feature #71] ParticleSugar lib initialized in Loading.
[Cleaning] Improved PS init, and fixed a bug in forest level.
Merge pull request #96 from aurelien-defossez/71-chunks

Issue #71 - Generic chunks
Close #71.