OpenVR support

CMakeLists.txt

applications/gui/CMakeLists.txt

applications/gui/src/camera.cpp

applications/gui/src/camera.hpp

applications/gui/src/ctrl_window.cpp

applications/gui/src/media_panel.cpp

applications/gui/src/media_panel.hpp

applications/gui/src/screen.cpp

applications/gui/src/screen.hpp

applications/gui/src/src_window.cpp

applications/gui/src/vr.cpp

applications/gui/src/vr.hpp

components/codecs/src/nvpipe_decoder.cpp

components/codecs/src/nvpipe_encoder.cpp

components/renderers/cpp/src/splat_render.cpp

components/rgbd-sources/src/sources/virtual/virtual.cpp