Custom-Death-messages

Added kill message gui added commands - /cm help, /cm reload, /cm add, /cm remove (all for the gui)

added permissions - customkillmessage.admin (for editing the gui)

• Added format "VictimName was (custom message) by KillerName using {item}" and made it the default format.

-added option to change color of words "by", "using" , "was" in the config.