Debug from .csproj and .sln

[WardenGnaw]

This request is to add support for debugging with the active file being a .csproj or .sln.

Adding a new language will break syntax hightlighting so a debugger needs to be able to register a specific file instead of a language for this to work.

Workaround:
Select a cs file within the project for F5 or Run and Debug to work.