Create a general/generic source settings plugin.

Create the equivalent of RV's SourceSetup plugin that works out of the box to configure source color for the most common situations to allow users to get started out of the box without a deeper pipeline.

The issue names no files, tests, or entry points. Start by locating existing source-settings plugins and reviewing the referenced RV SourceSetup behavior, then identify the common situations the generic plugin must cover. Done means users can configure source color out of the box without building a deeper pipeline.

Written by the indexing model from the issue text.