Rename ModelManagerInterface.(h|cpp) to cppmodelmanagerinterface.(h|cpp).
Rename TypeHierarchyBuilder.(h|cpp) to typehierarchybuilder.(h|cpp).

Change-Id: I035d833fd205d7460819bd0fb7031294359032f9
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>