Minor house keeping

[Timmoth]

• Used pattern matching where applicable
• public -> protected constructor on internal classes
• Moved HandlerTypeOfExpression out of NotificationMessage inner forloop since Symbol.GetTypeSymbolFullName() seems to be doing quite alot
• Removed commented out code

[martinothamar]

Hey, thanks for this! I've unfortunately just refactored some source generation stuff and I didn't see this until I had already merged... so thats why you have merge conflicts. The files you've cleaned up under /Analysis have gone into the SourceGenerator.Implementation project along with MediatorImplementationGenerator, while the MediatorGenerator has gone into the Roslyn38/Roslyn40 projects.

[Timmoth]

Hey, thanks for this! I've unfortunately just refactored some source generation stuff and I didn't see this until I had already merged... so thats why you have merge conflicts. The files you've cleaned up under /Analysis have gone into the SourceGenerator.Implementation project along with MediatorImplementationGenerator, while the MediatorGenerator has gone into the Roslyn38/Roslyn40 projects.

Updated!

[martinothamar]

Awesome, thanks!