Stop mypy daemon upon quitting and add buttons/hotkeys to restart it

[poscat0x04]

Right now the only way to restart mypy daemon is to do it manually in terminal. Also the daemon stays up even when exiting PyCharm.
It would be nice to add functions to restart the daemon since you have to do that to load new config files.

[ilevkivskyi]

Switching to dmypy run (merged recently) by default should partially address this. But it would be good to have a way to manually restart the daemon.

[ilevkivskyi]

(Probably we could add a button like "Issue custom command to daemon").