switch to TurboC3 submodule from Sourcehut

updated QOI

Create LICENCE.md

updated QOI to stable

updated QOI format (stabilising)

test support for QOI images

direct colour offscreen draw & blit performance test

SVGA direct colour testing..

bug fix: failed to build under TurboC

32-bit via DJGPP, proper SVGA modes working :=))

SVGA modes, although rather buggy and slow..

SVGA blit test

Initial import