Added Tmux Support

[whatever4711]

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name: Feature implementation for tmux
about: One terminal multiplexer to rule them all ;)

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Is your merge request related to a problem? Please describe.
Not a real problem. More like a frustration, if all terminals pop up and are hard to manage. In tmux all terminals are in their own window and can be navigated through

Describe the solution you propose
Added libtmux to the requirements and adjusted the implementation of Machine.py to create tmux windows for each machine and attach them to the tmux server session named Kathara. Added /usr/bin/tmux to the terminal selections in Settings.

Describe alternatives you've considered
I had a look at terminator and screen, but the Python library libtmux eased the implementation of the tmux multiplexer

Additional context
After selecting tmux as default terminal and a lab has been started with kathara lstart, you can access the session with tmux attach -t Kathara

[Skazza94]

Hi @whatever4711,
I reviewed the code and done some changes.
First of all, I removed the vstart meta. I prefer that the -v option of connect is explicit.
Then, I refactored the TMUX class a little bit (and capable of handle multiple sessions with a dict). I removed the "session creation" of TMUX inside the ManagerProxy (that class only forward calls to the correct Manager). Now everything is done inside the connect of Machine. I also added the tmux support on macOS (it is also available there).

I merged the PR into a branch called minor_features that will be merged with the master on the next release.

Thanks for the PR! ❤️

[Skazza94]

Hi @whatever4711,
just as a reminder the new version (3.0.1) contains this feature.

Thanks for you contribution!
Mariano