If multiple versions of Qt are installed, provide option to choose when creating project

Add a step to the Qt project creation wizard to select the version of Qt to use.

When I was trying to discover how to use the VS Addin, I had two versions of Qt installed and the ARM version selected as the default. I was unable to create a working project for several reasons:

• The default version of Qt was the version I had initially installed, an ARM Qt
• It was difficult to discover how to change the Qt version (QTVSADDINBUG-431)
• Once I switched version, I could not build (QTVSADDINBUG-430)

If I had to select one of the installed Qt versions, I do not think I would have had an issue building.