Pass our signing information to gradle by argument.
Changes from using environment variables that the world can see to arguments.
So we don't have to expose our keys and aliases to people
Merge pull request #196 from Sonicadvance1/gradle-buildoptions

Pass our signing information to gradle by argument.
PixelShaderGen: Cleanups and fixes for tev combiners.

Fixes issue 4674.
PixelShaderGen: Implement tev combiner lerping in a faster way which also reproduces hardware behavior perfectly.

The new behavior has been verified to be correct by hardware tests. This is an improvement over the old code, which was just a guess.