Vega Strike Code

Jupiter and saturn with new shaders

Fix a series of nonstandard shader idioms and implicit casts that break Mesa

Fix gas_giant fallback typo

Forgot to commit this shader

XML system and galaxy update to make use of new gas giant techniques

Gas giant techniques and shaders

Heightmap-equipped gas giant textures

Updating solution files and binary to r13324

CMake option for native optimizations (autodetects CPU type)

Fix MatchAngularVelocity imprecision (resulting in tumbling capships
making dock difficult, and who knows what else)