Add option to close tab on middle (wheel) mouse button click

Review Request #109571 - Created March 18, 2013 and discarded - Latest diff uploaded

Information
Oleksandr Sochka
konsole
Reviewers
konsole
There is no action assigned on middle mouse button right now
and this patch adds an option to Settings->Configure->Taskbar which enables 
closing a tab like in browsers/different editors using wheel click.

Option is disabled by default.
Tested manually
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