Added vehicle-surf setting and basic IRC script

Vehicle surfing can be toggled on and off now with the setting
"vehicle-surfing".

Added a very basic IRC script, this will be improved to support global
chat, muting and various other chat related things in the future.
Small fix for spectate, char saving and "Loot_dm"

Spectate timer fix, saveload now saves the correct position for
characters (was broken since the big update to player data) and
"Loot_dm.pwn" has been updated to match the changes to
AddItemToLootIndex.