Kits auto-detection kind of broken for clean settings and importing builds

Steps to reproduce:

• have several Visual Studio installations (MSVC2010, MSVC2015 & MSVC2017)
• have Debugging Tools and / or Windows SDK installed (cdb for 32bit and 64bit)
• have a Qt for MSVC (bin folder) in PATH
• start QC with clean settings

Current result:

• the auto generated kit can not be used out of the box in most cases
• compiler is most of the time not matching the one from the Qt (32bit vs 64bit) - or even worse (an incompatible MSVC version)
• the auto selected cdb seems to be always 32bit (bad - if you have a Qt / compiler that is 64bit)

Note: same applies when you have an existing build (removed the .user* files from the respective project path) with a Qt version that is no more configured inside QC (either by explicitly removing the kit / Qt version - or by restarting QC with a clean settings path) and try to import this existing build to the loaded project.