Switch to using OSGi nomenclature

[jeffdiclemente]

We want to be consistent with OSGi in every way which makes sense in the native C++ world. One of these ways is nomenclature/terminology.

All terminology within CppMicroServices (code and documentation) should be changed to use OSGi nomenclature, where applicable.

Some examples:

CppMicroServices 2.1.0 terminology	OSGi terminology
us::Module::Start()	us::Bundle::Start()
us::Module::Stop()	us::Bundle::Stop()
us::ModuleActivator::Load()	us::BundleActivator::Start()
us::ModuleActivator::UnLoad()	us::BundleActivator::Stop()
us::ModuleContext::InstallBundle(...)	us::BundleContext::InstallBundle(...)