Blitter Improvements

Rewrote the blitter completely, line mode support added, fill, singledot and textured lines are definately not supported. However kickstart image looks good (well apart from a single dot error in the top right hand corner of the disk).

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Work continues

Well, I have a very broken display going, no emulation of blitter line drawing means basically the disk and hand are not drawn, just some of the text. I still find it quite inspiring though.