RFE: update indicator, notification, and history view

[cody-somerville]

This is a suggestion / request for enhancement. IITC-Button provides an update mechanism for plugins. To keep user informed and aware of ongoing enhancements and possible changes to plugin behaviors, the IITC-Button could provide both a visual indicator that plugins have been recently updated and a view to show update history where ideally one could read relevant changelog entry. This could have downstream benefit of improving bug reports from users by more accurately identifying version of plugin issue is occurring with and if it started after a recent update or not.