Guides and grid color issues

[Ingolf]

I have configured my own colors for guides and grid in preferences, but they are not used in old or new documents.

I then try to disable them in the open document setup but nothing changes after clicking OK and re-opening document properties show them as active with default colors.

Changing these colors in every document min document setup works though, but ...

[VectorStyler]

@Ingolf In "Document Setup" -> Guides section, select a guideline color and confirm.
New documents should inherit this color.

(there are some problems related to this, that will get fixed).