Windows: fixed minor icon misalignment in pinned labels

https://bitbucket.org/sergiu/wtl-dockwins/commits/17639bab67a21b6041ef1a565ffaa0a69cd1adf4
Windows: fixed asserts executed while the application was being closed

https://bitbucket.org/sergiu/wtl-dockwins/commits/04e3820d2b38238cbb5b83d3c0207c4d1fd5f6ac
Windows: fixed DrawEllipsisText

https://bitbucket.org/sergiu/wtl-dockwins/commits/73eb2603aa51abbcde7a67509e16f401dea56028
Windows: prevent the ghostbar from being redrawn if the mouse position hasn't changed

https://bitbucket.org/sergiu/wtl-dockwins/commits/f3523262bc5b395fbbd8fba70027fafc35cc440b
Windows: reduced flickering perhaps

https://bitbucket.org/sergiu/wtl-dockwins/commits/d8fae7599310c0bbf27e396e15d56322faef1025