0.22.0 is finally published

This took way more than anticipated. I had a lot of work re-rendering all of the sprites, and on top of that I caught in some engine bugs. Luckily all of this is behind us and I present 0.22.0, featuring:

• New reflective material shader, including re-doing all of the sprites to include reflective. metallic parts.
• Fixed barely visible crash after player ship exploded and game ending.
• Game balance - fine-tuned asteroid density map and mineral map.
• Re-enabled missing sparks from Singularity Core.
• Fixed some memory leaks.
• Turbine no longer can be heard after ship explodes.