Victory/Endgame being Implemented

I have done a first version of the end-game/victory sequence. Completely unoptimised, and has taken my free memory down to 1500 bytes, which I think is still plenty to add lots of sound effects, thanks to direct ASM jiggery-pokery of the AY chip. Once those are in, then we are there, apart from final polishing up and gameplay adjustments.

Its in a separate branch for now, but it will get added to the final pre-release beta; obviously don't click on the video if you want spoilers.,