[Repository Explorer] Show features/bundles an IU is mentioned in #167
Description
There are sometimes the case that I have found a bundle (or package or ... ) and now I need to add something to my target.
Lets assume I have searched for packages (in advanced mode) then it would be useful to find what bundles in the repo providing them.
And for bundles it would be good to know if there is any feature that reference that.
So in general on rightclick there might be a new sub menu "References" that e.g. list other IUs that require that particular capability selected.