* Share one connect and close listener between subscribers
Every EventSubscriber added its own connect and close listener to the
connector, and Link caps the connector at 20 listeners per event. The
web Control and App use 13 close listeners, so the 8th plugin
subscriber made the browser log MaxListenersExceededWarning on every
page load. Subscribers on a connector now share one listener for each
event, which leaves the cap in place for everything else.
* Keep the connector subscribers as a static on EventSubscriber
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