[FR] Add a status-bar/tool-bar button for showing/hiding the terminal

[aminya]

I wish there was a button (status-bar or tool-bar) that I could press to show the already open terminal. I tend to do that a lot when I am coding. I do not want the terminal to be open all the time.

Now it is annoying every time I open and close the bottom dock, the linter is shown instead of the terminal.

[UziTech]

duplicate of #9