(MESS) spc1000: added support for tapes in .cas format [Fabio Priuli]

(MESS) spc1000: added emulation of joystick inputs [Fabio Priuli]

(MESS) added software list for Samsung spc1000 tapes [Fabio Priuli]

out of whatsnew: addition of joystick support made playable Space Invaders, Super Xevious, The Goonies and King's Valley.
I still have not complete control over github