Removed hard zone boundaries
Fixed stuff that broke because of hard zone boundary assumption (stardust placement, vertical fog)
Added a skybox!
Removed density-based albedo boost (_TintExponent) to improve perceptual uniformity at different step sizes, reconfigured shader to achieve / surpass previous looks and performance
Cell Brush has a material editor now to enable variant selection
Enabled Caching Shader Preprocessor
Moved raymarching loop into CloudShader
Get environment settings from game manager to enable configuration / variation
Introduced slope-based nebulae damping and volumetric flow
Hid optional volumetric features behind preprocessor branches
Created shader variants selected by global keywords for all shaders depending on volumetrics
Environment settings used to configure shader variant selection
Moved dynamic lighting settings to own subclass
Dynamically adjust gravity map isoline contour depth range according to zone contents
Applied nebula lit shader to "planets" and asteroids
Modified gas giant shader to accept nebula lighting and to be a bit less crappy in general
Fixed raymarching depth sampling perspective distortion
Modified fade texture to have those cool circuit trace designs
Added visible hostile indicator which fills to indicate player is being detected and flashes when detected
Converted entity materials to new fade shader
Implemented visibility system
Refactored per-instance entity code to run inside monobehavior on entity instances
Created state machine AI for enemy ships with basic patrol and combat routines
Removed legacy AI code (controller item behaviors)
Added automatic trigger group assignment for matched weapons
Created ship collision system
Created shield VFX and colliders
