evapi: store src ip and port in client connection struct
evapi: execute cfg event routes

- event_route[evapi:connection-new] - new client connected
- event_route[evapi:connection-closed] - client connection closed
- event_route[evapi:message-received] - message received from client
evapi: exported pv $evapi(key)

- key can be:
	* srcaddr - source ip of client connection
	* srcport - source port of client connection
	* msg - message received from client
	* conidx - internal index of client connection
evapi: pass local env via sip msg structure
evapi: added evapi_close() function

- close client connection from cfg file
evapi: docs updated with evapi_close(), new event routes and pvs