Moved fill and copy routines to their own files.

--HG--
rename : src/video/SDL_blit_copy.c => src/video/SDL_copy.c
rename : src/video/SDL_blit_copy.h => src/video/SDL_copy.h
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402615