Feature: More communication interfaces for MCDR clients

[Ra1ny-Yuki]

Multiple interfaces are provided to access client data or execute commands for CBR plugins. But it's imposible to access CBR server plugin interfaces legally from MCDR client side.

Maybe adding following interfaces to CBR_mc clients cound change this situation:

def dispatch_plugin_event(event_id: str, *args, **kwargs)
"""
Dispatch a plugin event in CBR server, and CBR plugins could register plugin event listener 
to listen events from client or CBR server side and execute custom stuff
(this may requires a proper plugin event system in CBR server side)
"""

def server_plugin_api_query(plugin_id: str, function_name: str, *args, **kwargs):
"""
Corresponding to server side interface CBRInterface.api_query()
Allow mcdr plugins query the result of CBR plguin
the parameters and usages should be simillar with the interface mentioned above
"""