Revert "LPS-45033 My eclipse doesn't seem to give these warnings"

This reverts commit dad506281d51ee0678e9ce547d5f21290078c0b5.
Revert "LPS-45033 As a developer I'd like to be able to register StagedModelDataHandler impls from OSGi"

This reverts commit 5dd078919f24f2f2a80a6c7124f77e264529638f.