Missing impls in analysis

[projektir]

This is needed for #121.

Impls do not seem to be included in the AnalysisHost the for_each_child_def or find_impls methods when called on the root, even though they're present in the "deps". It seems perhaps that they're not being added to relevant fields when processed, so even though they seem to get captured in the analysis, the functions above don't return them.