Testing DIB Engine - Better blitting and partial ROP3 support

[Massimo Del Fedele]

Hi,

I made some changes to DIB engine :

1) Some more consistent DIB type naming and color handling
2) Partial implementation of 256 ROP3 operations
3) Partial ROP3 implementation on blitting (stil no pattern)
4) Some optimizations in blitting code

I attach here the zipped patches.

Ciao

Max