Fuse.Text: make sure color is pre-multiplied
Fuse.Text: make sure color is pre-multiplied

This fixes #918.

kusma/fuselibs-public,yupferris/fuselibs-public,nekronos/fuselibs-public,yupferris/fuselibs-public,nekronos/fuselibs-public,cbaggers/fuselibs-public,eksperts/fuselibs-public,fusetools/fuselibs-public,kusma/fuselibs-public,fusetools/fuselibs-public,eksperts/fuselibs-public,kusma/fuselibs-public,yupferris/fuselibs-public,eksperts/fuselibs-public,nekronos/fuselibs-public,cbaggers/fuselibs-public,nekronos/fuselibs-public,cbaggers/fuselibs-public,yupferris/fuselibs-public,eksperts/fuselibs-public,nekronos/fuselibs-public,fusetools/fuselibs-public,fusetools/fuselibs-public,yupferris/fuselibs-public,eksperts/fuselibs-public,kusma/fuselibs-public,cbaggers/fuselibs-public,eksperts/fuselibs-public,nekronos/fuselibs-public,kusma/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,eksperts/fuselibs-public,nekronos/fuselibs-public,cbaggers/fuselibs-public,fusetools/fuselibs-public,kusma/fuselibs-public,kusma/fuselibs-public,yupferris/fuselibs-public,fusetools/fuselibs-public,cbaggers/fuselibs-public,yupferris/fuselibs-public