...and remove some unncessary using directives/declarations, in preparation of removing now-unnecessary #includes from cppumaker-generated files, post e57ca02849c3d87142ff5ff9099a212e72b8139c "Remove dynamic exception specifications". Change-Id: Iaf1f268871e2ee1d1c76cf90f03557527ebc9067
Helper functionality for implementing UNO components ...anything not generic/mature enough to end up in URE's stable interface at cppuhelper etc.