Remove Unnecessary Imports for C#

Requires the OmniSharp (C#) extension to be installed!

Adds a code action to remove unnecessary imports from C# files. Simply add source.organizeImports to your editor.codeActionsOnSave like so:

{
    "editor.codeActionsOnSave": [
        "source.organizeImports"
    ]
}

and any unused using directives in C# files will be automatically removed upon saving.