Dynamo Addin Generator

This pull request is for the addition of a utility to generate addin files based on the Revit Products and dynamo installs on a user's system at run-time. The DynamoAddinGenerator.exe now runs at the conclusion of the install. It deletes all existing dynamo addins and generates new ones. This pull request also updates the Dynamo install location to <Program Files>\Dynamo 0.7.

The DynamoAddinGenerator.exe and the RevitAddinUtility.dll (2015) are bundled in the installer and will appear in the install's base directory.

The addin should recognize for the following install locations:

C:\Autodesk\Dynamo\Core (0.6.3)
C:\Program Files(x86)\Dynamo071 (0.7.1 - before we fixed the x86 folder issue)
C:\Program Files\Dynamo071 (0.7.1 - after we fixed the x86 issue)
C:\Program Files\Dynamo 0.7 (0.7.x - install location as of this PR)

The generated addin should point to a DynamoRevitVersionSelector.dll in the appropriate Revit_2014 or Revit_2015 subfolder of the Dynamo install. The version selector external application logic is responsible for registering Dynamo installs as buttons in the Revit ribbon.
Reverse line order on all of these.

If the delete fails for some reason it'll make it a lot easier to understand what it was about to try and do