tweaks to generating tracks files that should be a bit cleaner

tracklines are now interrupted, but not sure whats up with non-durative actions not really getting called

reformatting, adding heartbeat that can interrupt ongoing tracklines, re-insert the string-to-symbol functions

descent sequence correctly transitions between states and tracklines now that a state class exists, but more to do here

threaded behavior with state checking, cleaner delay functionality, automatic generation of behaviors