VS 16.7 compatibility

Vsix

• Workaround Visual Studio 16.7+ that was causing VB->CS conversion to fail #586

VB -> C#

• Handle Option Compare Text case insensitive comparisons in switch statements #579
• Fix compilation error when switching with enum cases #549
• Improve numeric casts #580
• Add ref to conversion of RaiseEvent where needed #584
• Rename clashing type memvers #420
• Fix conversion for string implicitly converted to enum #476

C# -> VB

• Rename explicit method implementations where needed #492
• Include type information in conversion of default(someType) #486