Merge pull request #1 from SupSuper/master

Backporting
Merge remote-tracking branch 'upstream/master'

Backport.
Dumb warnings
fix textlist selector one more time
Smooooother Drag Scroll
Oh, and RMB can be used to DragScroll on minimap, again.
Fixing up installer and docs
fix disambiguation
fix compile error

i guess signed - unsigned = unsigned?
fix new battle UFOs on load

not just save ;)
add safety
OpenXcom::SeverityLevel::LOG_DEBUG unavailable there... damn
it is now!
Fix Quick Load without a quicksave crashing game.
Merge pull request #843 from fenyo1/smoothDragScroll

Smooooother Drag Scroll
Tweak comboboxes
fix minimap scrolling
fix autoshot centering thing
fix arrow colour
don't recover ammo from weapons that use themselves as ammo
adjust selection arrow