jdrst

fixes #1003 i didn't test if this has implications with a different OS, if this is even the right place for a fix or if this is "ok" dart but...

as per [this](https://github.com/OmniSharp/omnisharp-roslyn/pull/1362) the `--stdio` flag is deprecated but still [documented](https://github.com/OmniSharp/omnisharp-roslyn/blob/master/doc/Using-Omnisharp.md)

When working with required/init props (e.g. in records), the generated code has the following error: `FooBuilder.g.cs(64,38): Error CS7036 : There is no argument given that corresponds to the required parameter...

Fixes #174

When generating documentation files via `GenerateDocumentationFile` for a project with strongly typed ids (and `TreatWarningsAsErrors` set to `true`) it errors out: ``` StronglyTypedIdDefaultsAttribute.g.cs(56,86): Error CS1573 : Parameter 'templateNames' has no...