Notify contact requests (let's discuss about this)

[adbenitez]

@csb0730

As I remember (with v0.9.3 in each case) there was a user setting to show “contact requests” like a normal chat so You’ll get informed with every new message there.
The disadvantage was: If You get many new mails (spam!) in “contact requests” this chat is always on top of chat list and disturbes You (maybe).

This is what I am talking about:

see: Make Contact Requests more visible