Terrain Destruction and Web Version

Robocave is a game about robots in a subterranean voxel world, originally called Robot Caves for the 7dfps jam.  The focus of 0.2.0 was porting the code to Rust, adding the features below, and releasing a web version.

New:

• Missile weapon
• Destructible terrain
• Energy bar
• Initial inventory HUD
• New robots, but currently all behave the same
• More sound effects
• Stats at the end of game
• Wall terrain around arena