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core.moduleapi: Return resource path from module:get_directory() (API BC) :get_directory has so far returned the base directory of the current module source code. This has worked well so far to load resources which tend to be included in the same directory, but with the plugin installer using LuaRocks, extra resources (e.g. templates and other assets) these are saved in a completely different directory. In be73df6765b9 core.modulemanager gained some code for finding that directory and saving it in module.resource_path but now the question is how this should be reflected in the API. A survey of community modules suggest the vast majority use the :get_directory method for locating templates and other assets, rather than the code (which would use module:require instead). Therefore this commit changes :get_directory to return the resource_path when available. This should work for most modules.

No 'to' attribute:
	IQ:			Pass to appropriate handler
	Presence:		Broadcast to contacts
				- if initial presence, also send out presence probes
					- if probe would be to local user, generate presence stanza for them
	Message:		Route as if it is addressed to the bare JID of the sender

To a local host:
	IQ:			Pass to appropriate handler
	Presence:		-
	Message:		Deliver to admin?

To local contact:
	Bare JID:
		IQ:		Pass to appropriate handler
		Presence:	Broadcast to all resources
		Message:	Route to 'best' resource
	Full JID:
		IQ:		Send to resource
		Presence:	Send to resource
		Message:	Send to resource
	Full JID but resource not connected:
		IQ:		Return service-unavailable
		Message:	Handle same as if to bare JID
		Presence:	Drop (unless type=subscribe[ed])

To remote contact:
	Initiate s2s connection if necessary
	Send stanza across