Multi-window support

[ShGKme]

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Is your feature request related to a problem? Please describe.

Sometimes it's useful to have several chats open simultaneously. Especially while in a call.

Describe the solution you'd like

Opening chats in new windows

• It should be possible to open a chat in a new window
  • Via CTRL+Click
  • Via a conversation menu
• A conversation open in a new window should be simple to bee one conversation page:
  • No conversation list
  • No custom title bar

Describe alternatives you've considered

An alternative to a multi-window view could be tabs in the primary window.

Additional context

Should include fixes for:

• Add context menu to about (help) window #126
• Desktop client crashes on trying to re-enter a group call #838
• Allow to join other conversations while in a call #104

[raimue]

Related issue (duplicate?): #104