[Feature request] Closing window closes the program, not reduces it only

[gustavklopp]

Wonderful program! Thanks so much!
I've got a feature request after noticing something:
When clicking on the 'x' to close the window of the program (by the way, it's strange not to have an 'exit' button), the program doesn't close but reduces only.

What I think would be interesting:

• Add a an 'exit' button
• Add an option into 'settings' where you can choose whether the exit button:
  -closes the program
  or -reduces the program