Fixed unwanted DoubleClick event handling

[mstrini]

Fixed unwanted DoubleClick event handling

• if window is not focused e.g. DoubleClick happend on the title bar of another maximized window while the EasyTab-window is in the background)
• if multiple clicks happen on different points within the doubleclick-interval and within the control-area e.g. fast witching between tabs fixing #73 and #75

(+ unified indentation in the file)

[NicatQaraxanov]

The issue is not solved. When clicking on tab twice it gets minimized. I'm trying to listen this double click event by overriding WndProc but it does not recognize double click on tabs. Can someone please explain with details how can i prevent double click on tabs.