Move CONTRIBUTING.ms and LICENSE.txt back to root of repository.
Second attempt at fixing infinite loop when mapgen can't find anywhere to put a staircase.
Nuke some accidentally merged debug messages.
UIMenu: Start scrolling in the middle of the list and keep the selection centered as long as the list isnt at the top or bottom.
Interface option for centered menu scrolling.

So far supported by uimenu.
option: Interface option for centered menu scrolling.
uimenu: Scrollbar place indicator for large scrolling lists.
Scroll indicator: No hiding, actually apply color option
Merge scrolling changes.

Conflicts:
	options.cpp
	ui.cpp
Default to center-scroll.
Don't cache center scroll setting so you can toggle it in-game.
Merge some small bugfixes
Remove the vhtype_id enum; vehicles are now referenced by name.
Documentation update.
Fix dispersion comparisons
Stop underwater weather effects
Add power armor acid rain protection effects
Merge remote branch 'origin/master' into scrolling_option_and_indicator
uimenu: scrollbar has better position calculation, consistent size >= 2.
Formatting tweak
cleanup