Remove hand-written BitBlt implementation
Remove hand-written BitBlt implementation

Replaced by generated BitBlitPlugin

Speed-Pad/online,fmateoc/SqueakJS,fniephaus/SqueakJS,fniephaus/SqueakJS,fmateoc/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,fniephaus/SqueakJS,fmateoc/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,bertfreudenberg/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,sebastianconcept/SqueakJS,the-impossible-quiz-revisited/the-impossible-quiz-revisited.github.io,Speed-Pad/online,sebastianconcept/SqueakJS,fmateoc/SqueakJS,fniephaus/SqueakJS,bertfreudenberg/SqueakJS,bertfreudenberg/SqueakJS,sebastianconcept/SqueakJS,Speed-Pad/online,bertfreudenberg/SqueakJS