Palette cleanup - replace COLOR_FG with COLOR_WHITE, rename COLOR_BG to COLOR_GREY_DK.
Palette cleanup - rename COLOR_SPLASH_RED to COLOR_RED_DK, COLOR_SPLASH_PINK to COLOR_RED_LT and COLOR_SPLASH_GREY to COLOR_GREY_LT.
Palette cleanup - rename COLOR_HISTO_xxx colors (used by more than just histogram).
Palette cleanup - replace SCREEN_COLOR with COLOR_BLACK, remove SCREEN_COLOR from palette.h
Palette cleanup - consolidate common sections in palette.h, remove some redundant items missed in previous updates.
Fix light & dark blue script colors, for cameras that implement custom colors.
Add color test mode to palette module.
Align A3300IS with other cameras using custom colors.