* add notification cooldown
* cooldown docs
* show alert box when notifications are used in an insecure context
* add ability to suspend notifications from dashboard context menu
* backend
* frontend
* add notification config at camera level
* camera level notifications in dispatcher
* initial onconnect
* frontend
* backend for suspended notifications
* frontend
* use base communicator
* initialize all cameras in suspended array and use 0 for unsuspended
* remove switch and use select for suspending in frontend
* use timestamp instead of datetime
* frontend tweaks
* mqtt docs
* fix button width
* use grid for layout
* use thread and queue for processing notifications with 10s timeout
* clean up
* move async code to main class
* tweaks
* docs
* remove warning message
