Optimized bitmap blitting: cache native (converted) bitmaps.

This required an change to the convert and blit routines - for opaque images, they convert the whole image. Transparent images are still converted on demand and still only the clipped area is converted. This is incomplete - native buffers should be stored in the well known bitmap buffer, but currently the bitmap struct holds a second buffer which contains converted data.

svn path=/trunk/netsurf/; revision=13886

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