Update already generated IDE project when bf is called

[jimon]

(LOL the project starts to look more like vox player - testing, testing, testing and barely any new features)

Looks like my current workflow is following:

1. Case when a repo is clean:
   • Add compiler to the env by calling ... vcvarsall
   • Call bf --ide qtcreator
   • Enjoy my IDE
2. Case when repo already used and I need to update IDE project
   • Add compiler to the env by calling ... vcvarsall
   • Call bf --ide qtcreator
   • Enjoy my IDE

I wonder if it makes sense to make second step kinda as following:

• Fix Investigate if we can call vcvarsall.bat from BuildFox #118 so I don't need to call vcvarsall by hand.
• Call bf, let it figure out that IDE project is present, update IDE project automatically
• Enjoy my IDE

Or is it better just to fix #136 instead? Not really sure atm.