Add support for both gamma-corrected and linear for all bit depths
- Add new enum GimpComponentType which contains u8, u16, u32 etc. - Change GimpPrecision to be u8-linear, u8-gamma, u16-linear etc. - Add all the needed formats to gimp-babl.c - Bump the XCF version to 5 and make sure version 4 with the old GimpPrecision enum values is loaded correctly This change blows up the precision enums in "New Image" and Image->Precision so we can test all this stuff. It is undecided what format will be user-visible options in 2.10.