GitLab

 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).

Removing ms_factory_uninit_plugins when destroying the factory since it is already called in ms_factory_destroy.

mediastreamer2-sound_card_tester still uses the fallback factory.
Added reference to MSFactory in MSSndCard an MSSndCardManager.

Added a new test to check character by character mode, fixed memory leak and receiving end unable to read more than one character issue