WINTERMUTE: Done some refactoring to the blending functions, after profiling the code I verified that functions weren't inlined with the previous method so I created three functions that execute different types of blending.
I also moved the kA/R/G/BIndex constants in the cpp files and scoped them locally to improve readability.
WINTERMUTE: fixed style of commited code.
Merge branch 'master' of https://github.com/subr3v/scummvm