Expose route to set formatting options

[anfomin]

I've configured VS Code to always use tabs:

// Place your settings in this file to overwrite the default settings
{
    "editor.insertSpaces": false
}

But C# Format Code command (Shift+Alt+F) always replaces tabs with spaces. I'm using OS X El Capitan.

[jrieken]

This is because OmniSharp doesn't support per request formatting options (https://github.com/OmniSharp/omnisharp-roslyn/blob/master/src/OmniSharp.Abstractions/Models/v1/FormatRangeRequest.cs#L6). Moving to OmniSharp for that.

[jrieken]

@anfomin - Do workaround this, you can create an omnisharp.json with the config

[jrieken]

This issue was moved to OmniSharp/omnisharp-roslyn#366