Temporary fix for Players attempting to cancel other types of exchange whilst involved in a different exchange.
Vault(1.2.15) doesn't support the new sandstone blocks, This means that these blocks will be completely un-tradable.
If you use a Plugin that edits time actively (Such as properTime), or you change the time manually whilst players are exchanging items, Timeouts will freeze! (This means the request-timeout will never occur, and any items will remain in limbo until they are accepted, denied or cancelled.)
A Major rewrite of a lot of code has been done in this version, If I missed something/something isn't working, Please let me know!
