core: Add default HLine implementation.

Fall back to loop with PutPixel if there is no WritePixel for the
particular pixel type.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
core: Add header GP_Version.h

Add header with GFXprim version

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
GFXprim 1.0.0-rc0

Signed-off-by: Cyril Hrubis <metan@ucw.cz>