quiet spritesheetparser debug a bit more, now that it works well

also document about how hot the path is for frame lookups(hint: very)
right arrow movement moves at a decent speed now

no friction though, so it's infinite. and no collision yet :(
minor collision attempts
enable width/height usages to properly work, at command line for

res/winsize setting(e.g. my laptop is too crappy to have anything more than
1366x768)
woo, left/right works as well as collision on right only

even works if our speed is way faster than what our needs will ever be
for the player. at least, horizontally.