Add /resetwindows command

[zunath]

Add a /resetwindows command which reinitializes all of a player's window positions and sizing.

Bug Report I've somehow tossed my Perk window off the edge of my screen and I can't pull it back from where it is. There's just a tiny slither of the border in the top left corner of my screen, it disappears and reappears if I press Perks in the menu, but since it remembers the location it stays where it is. Not sure how I did it, I was just buying perks and it sortof lagged, glitched out, pinged across my screen or something. I wasn't like dragging it or anything.