- Updated USDF spec to version 2.1

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4026 a95907f1-e10c-0410-b46f-9e587ccb1026
- Fixed: BobStyle was assigned as if they were flags.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4027 a95907f1-e10c-0410-b46f-9e587ccb1026
- Fixed: If AInventory::SpecialDropAction returns true the item should be destroyed.
- Fixed: Building with SSE disabled triggered an error.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4028 a95907f1-e10c-0410-b46f-9e587ccb1026
- Fixed: 0 duration A_Lower loops could cause an infinite loop since A_Lower checked if the player was dead in two different ways and returned before the second one.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4029 a95907f1-e10c-0410-b46f-9e587ccb1026