[ChannelTabs] Request: Rightclick menu option to open all channels with unread messages

[problem-child]

Is your feature request related to a problem? Please describe. I create a favourites folders containing announcement channels from multiple servers so that I can see at a glance via the message bubbles whether there is an announcement I need to catchup on. Currently I repeatedly open them one by one, but it would be great if there was a feature to open all favourites with a folder where there are unread messages

Describe the solution you'd like Add a new context menu option after 'Open all' for 'Open all unread'

:heart_eyes: :pray: :rocket: