Changes Visual Studio Add-in 1.1.9

The Qt Visual Studio Add-In version 1.1.9 contains multiple bugfixes and
improvements.

Changes
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- Fix a regression when importing .pro files that was introduced in 1.1.8.
- Make the add-in work with Intel VTune projects. (QTVSADDINBUG-65)
- Check for compatibility with VS version when adding new Qt version.
  This will hopefully stop people from trying to use a MinGW Qt build with
  Visual Studio. (QTVSADDINBUG-58)
- Added possiblity to specifiy lupdate/lrelease options. (QTVSADDINBUG-48)