Update to Denizen 1.2.0

[DSroD]

Denizen version 1.2.0 presented changes that break MythicDenizenAddon, including

• Method ScriptEntry.getObjectTag(String) no longer returns T extends ObejctTag, it is now of more general return type T.
• ScriptQueue got id generation update - method ScriptQueue.getNextId(String) no longer exists.