Added module registration api to vtkWeb, also added registration.
In vtkWeb object there is now a function to register modules by name, as well functions to determine whether a module or a list of module names have been registered or get the list of currently registered module names. The main vtkweb modules now register themselves using this api. Change-Id: I195c39ae3c57f28c08ec87cb048134a7f18826a8
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