Internal caching of small sprites to increase tiled plotting speed.
Fix for not filling the right pixel of a clipping rectangle for 1px wide tiled images.
svn path=/import/netsurf/; revision=975
Support for sprite tiling.
Optimisations for plot handlers.
Removed the need for SpriteV and PaletteV vector routines in favour of service calls and an additional flag word for use outside the WIMP.
svn path=/import/netsurf/; revision=934