RocketSim v2.2

This update adds the DROPSHOT gamemode, along with many fixes and improvements from v2.1.1.

Notable Commits:

Features:

• (Experimental) Add dropshot
• Add partial support for psyclops
• Greatly improve heatseeker accuracy
• (Experimental) Add custom boost pads support
• Add CarState.isBoosting, rename .timeSpentBoosting to .boostingTime

Bug Fixes:

• Fix tiny memory leak in btRSBroadphase
• Fix non-zero boost timer with 0 boost
• Fix bugged rot mat inversion in PhysState.GetInvertedY()
• Fix extremely short jumps stopping jump time prematurely