* Allow activity change on start of switch
Allow activity to be updated when a switch to a new activity is initiated instead of when it is completed.
* Updates based on feedback
Some items are not required to be done as YAML is not used anymore.
Cleaned-up some code.
* Fix for change on how to set callbacks
How callbacks are set now one has to set the new_activity and new_activity_starting as well, even just with None.
* Added callback update
Added so that when it is changed in the UI the callbacks will be changed as well.
* Added test cases for notify setting
Added test cases for config flow to test new setting for activity notifications.
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