(backport) OpenGl fixes: - Load only local libraries to avoid conflicts or unwanted...
OpenGl fixes: - Load only local libraries to avoid conflicts or unwanted external libraries. - Remove empty logs from link/program. - Leak and crash: Destroy context and fix MakeCurrent on threads. - Fix crash when no display. - Fix having no preview window with Auto display (preview_window_id is 0). - Fix mac filter to use a window when changing window mode to auto. Test for memory usage on displaying multiple previews. Test for memory usage on displaying video while being in call. Fix build error on video display constant cast (UWP). Tester function to get memory consumption. 'bc_test_get_memory_consumption()'