inputhookqt4: make hook more robust in case of unexpected conditions...

inputhookqt4: make hook more robust in case of unexpected conditions - return early if there's no longer a qApp - trap any exception that could be raised from within the hook, report it and unregister the hook

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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute

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