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Fix trailing references causing memory leak
==== Fixed Issues ====
#1014 If not resolved atleast vastly improved
==== Tech Notes ====
This PR corrects a couple of small issues led to skills being left in memory when.
stop.mycroft
weren't removed from event emitter whenskill shut down. Now is added using
self.add_event()
self.events
created a circular reference thatpython couldn't resolve a live so this is now deleted at shutdown
timer is alive it will be joined
==== Documentation Notes ====
Registering event handlers should use
self.add_event
instead ofself.emitter.on()
To make sure they are cleaned up when skill isterminated.