'sal-lighting' code ports from v2

Salrequested to merge
TehRealSalt/Kart-Public:sal-lighting-port into awful-mix

This means:

  • Model blends use hue shifting (Jeck will need to provide new blend textures so that colors aren't made too dark)
  • Water surface shader
  • Lighting shaders support fadestart and fadeend
  • Wall fake contrast
  • HWR_Lighting was updated to not mess with lighting when using shaders, so my lighting shader appears properly
Edited by Sal

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