Add r2048 game in V! command. Initial sdbization of fcn vars
prevent T in visual-mode from segfaulting

thx @thejh
someone, please take a look at this, the real bug might be still existing
fix an io-map bug

this makes the wall of 0xff at the end of this video less scary : http://runas-racer.com/foo/io_bugs.mp4
correct a few esil-strings