C64_DeMiSTify - C64_mist demistified

DE10-lite board top level
	with Alastair M. Robinson's hardware interface 
	with DarFPGA's hardware interface 
	
DE0-nano board top level (FIT OK with only one 8580)
	with DarFPGA's hardware interface 

Early tests
	Keyboard OK
	Sound OK
	TAP OK
	D64 OK
	CRT OK
	G64 not tested
	PRG OK
	15KHZ Video OK (add a file named '15KHZ.CFG' at SD root)
	
	Swap keyboard cursor keys between JOY1/JOY2 with ctrl-F1