modules are identified via URI instead of namespace/moduleId 4-byte chars
removed ModuleDescriptor class (which is not used anymore)
removed state signaling/managing from Module base class / clean-up of module class (still work in progress)
ModuleHelper class is deprecated (existing/new modules should derive directly from Module)
small fixes/extensions in helper classes (XMLHelper and FileHelper)
fixes in SampleBuffer class
base cmake file does not check extenal dependencies for all sub targets anymore. Each subtarget must include the config files for external dependencies