[Feature request] Exiting the app, when the last tab is closed

[avgrad]

Is your feature request related to a problem? Please describe.
Not really a problem. I think of it as a usability/customisation improvement.

Describe the solution you'd like
I would like the app to exit, when the last open tab is closed. There could be a setting (in the Advanced Settings), to let the user decide if the app should behave this way.
Notepad++ has a setting called "Exit on close the last tab" for this. I don't quite like the wording, I would call it "Exit app when last tab is closed".

Describe alternatives you've considered

Additional context
I have already forked the repo and implemented the described solution. If you want, I would be happy to create a pull request.

[0x7c13]

The main issue is that Windows will not remember window last opening position and size if the app is exited programmatically. I have OCD and I do not want that to happen.

[soumyamahunt]

@sydeslyde implemented in #601.