progress on porting frameworks and apps

Some frameworks in use around the rM1 community for building apps:

framework	lang	status	apps
libremarkable	rust	finished	retris, chessmarkable, plato, whiteboard
remarkable.NET	C#	not started
rmkit	cpp	finished	harmony, mines, remux
qtsgepaper	cpp+qt	finished	calculator, draft, oxide, wikipedia, keywriter, chess2
koreader base	cpp+lua	finished	koreader

Apps that have been tested:

Apps to test:

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