GetFrameworkVersion() throws an System.NullReferenceException since
there is no Registry on non-windows systems.
Fixed by checking the OS under which the program runs. If it's not
Windows, check the CLR Version instead of querying the (non-existant)
registry.
* Catch MissingMethodException and Direct Users to .NET Framework 4.6 Install
* Revised .NET Framework Warning Message
* Check .NET Framework Version on Launch
* Check .NET Framework Version on Launch
* No Locale for Microsoft Download Center
* Check for Missing Code Library with Error Message
If PKHeX.Core (or other external dependency) is missing, display an
error message at launch.
Closes#763
* Fix Missing PK1->PK7 Geolocation
VS wouldn't break at the line that threw the exception; only have the
custom exception handling for release builds (ie the CI server & posted
builds).
makes it easy to debug again