FScript Lib

Script changes:

• add ~inventory, ~slot, ~slot~int (note that ~slot~int works with the Inventory interface and will not use the armor and offhand id's specified on minecrafts wiki)
• allow embeding possible super classes ~living ~player, ~server_player (usefull when wanting to add player exeptions to a more general script)

UI changes:

• misc fixes for rare screen resolutions
• added F1 scroll bar
• fixed another bracket related ui loading issue