Removing static MSWebCamManager. There is now manager for webcam and one for sound
accessible from the MSFactory. Adding MSWebCamManager* in MSFactory. Adding MSFactory to MSWebCamManager* and pointer to manager in MSWebCam. Using ms_factory_wbc_amanger or snd_manager get to get pointers to the managers. Using ms_factory_create to create a new factory and initialize it (ticals ms_factory_new and ms_factory_init plugins and voip).
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