Better error handling and semi universal vault economy handling
* Added new error messages so errors shouldn't show in the console in these cases.
** Cases included but not limited to, typing in /mk without parameters and giving an incorrect parameter
* Updated the way M4M gets the economy
** This way has been tested on EssentialsX, Mineconomy and iEconomy.
*** This should work with most Vault ecomonmies. I've noticed Acomony is coded weird and I have a separate DEV build if anyone uses that economy