Ability to restart worker via command

[dead-claudia]

With the frequent OOM bugs I've run into with TS, it'd be nice to be able to kill (if alive) and restart the TS worker so I can resume having types checked after doing whatever to fix it short term. (It'd also be helpful after, say, a TS update, so I wouldn't have to restart my editor.)

[guncha]

I just use Ctrl+Alt+Command+L to reload the window, but yeah, a command would be nice. Even nicer would be Typescript not crashing.

[shellscape]

Seconding this. I can't count how many times a day I need to kick Atom when working with linked modules and updating the type definitions. /cc @lierdakil

[shellscape]

@lierdakil which commit in #1456 addressed this issue?

[lierdakil]

e4a753b