It tries to mitigate issue #239, but it's not a full fix yet. A good
possibility would be to change the internal structure of images, creating
tiles. So we don't need to allocate/copy/clear/etc. huge images in each
step.
- Rename _rgba/_graya to raster::rgba()/graya()
- Add raster::color_t type (alias for uint32_t)
- Rename raster::GfxObj to Object. And GfxObj::getType() to Object::type()
- Move conversion from raster::Image/Palette to Allegro BITMAP/RGB
to raster/conversion_alleg.h file
- Add raster/color_scales.h
- Rename image_* functions to raster/primitives.h
- Reimplement ink processing with templates instead of macros
