Remove wondrous VS version detection logic

Replace which_dotnet_version with a simple function that converts the
value of MSVC_VER to its corresponding enum value in the VS project
generator.
This reduces the maintenance burden when adding support for a new VS
version, because we do not need to update the registry keys in
which_dotnet_version anymore.
The which_dotnet_version function implemented the following logic:
  - find all installed VS versions via registry
  - select the "best matching one"
  - if there is no best match, select the VS that's in PATH
  - create a project for that VS installation
The usefulness of this whole stunt is questionable as the VS version of
Qt's mkspec must match the version of a project using that Qt anyway.

Change-Id: I9fb9a099ee5ddb5fc4c450be4f68f41f2b406b9a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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