Make single left click delay for tray mouse events configurable

[hllmtl]

There seems to be about half a second delay between left clicking the tray icon and the event set for single clicking happening. If you right click and select it manually from the menu (mute/mixer/etc.) it is instant so this feature request assumes the delay is deliberate to listen for the second click (when a double click event is set). ~500ms is a bit lax though, so it would be a lot better if we could and set it to our preference.

Also probably related: #93

[irzyxa]

It is configurable. I get value for double click from Windows.

[irzyxa]

And if you do not set any action on Double click, Single click works immediately.