Add scriptcs.exe -analyze

[filipw]

trafficstars

This will return information such as this https://github.com/OmniSharp/omnisharp-roslyn/blob/master/src/OmniSharp/ScriptCs/ScriptCsContext.cs

So basically everything that is needed to run the script, except for running the script.

This is needed for language services support in scrawl and potentially in omnisharp at some point too.

cc: @stirno

[adamralph]

Let's add this to the next milestone if and when the change is merged.