Availabiltiy for chats should update status automatically

[MarcG1]

currently you have to select manually "not available" for chat-status. there is no connection between your calendar and the chat-status. instead in the meeting functionality there is an automatic availabiltity-check.

so my idea would be, that the availability-check should be also integrated into the chat functionality. 

[Daniel_Mehlich]

This is a great idea, would be a lovely addition!