Tray Icon Double-click - multi-function

Summary: Make it possible to SET the function of tray-icon double-click

Right now, double-clicking on the tray icon opens the folder where greenshots are saved, but that's is not the most logical function of the double-click. 99% of greenshots I and many people take, they edit with the editor so double-click on the tray icon should launch the editor, if anything.

Because people disagree on exactly WHAT the function of the tray-icon double-click should be, it would be best if each user could choose their double-click function themselves, between the following:

1. Launch editor
2. Open Greenshot folder
3. Print
4. etc