GUI: merge toggleHidden() code into showNormalIfMinimized() #1420

• to extend the functionality, but keep a simpler toggleHidden() for use in SLOT() macro

As toggleHidden() has some functionality in, that is good for showNormalIfMinimized() I moved the code to it.

I was not able to completely remove toggleHidden(), as SLOT(showNormalIfMinimized(true)) is not allowed. If someone knows how to use showNormalIfMinimized(true) in SLOT I can update this.

This means you can also remove the following from handleURI:

if(!isActiveWindow())
    activateWindow();

"Binding" a parameter, as it is called, to a SIGNAL or SLOT is not possible with Qt, so we'll need to keep toggleHidden around.

Updated, and removed this from handleURI:

<pre> if(!isActiveWindow()) activateWindow(); </pre>

ACK