Record for each source folder which Eclipse scope it is used by Eclipse source folders each have a scope assigned to them. This is currently the name of the SourceSet, but might evolve later to be the name of the component instead. The exact value is an implementation detail.
However, we also need to track all the scopes that *use* that source folder, so its output can be included when running applications and tests in Eclipse. The output folder is not explicitly modeled in the .classpath file, but instead implicitly belongs to the source folder.