• usb3vision: make async libusb default (@EmmanuelP)
• usb3vision: improve CPU use when no buffer is available for the stream thread (@EmmanuelP)
• usb3vision: don't wait forever for USB transfer completion (@EmmanuelP)
• usb3vision: enable stream after the receiving stream thread is started (@EmmanuelP)
• viewer: avoid buffer exhaustion if GStreamer pipeline is late (@EmmanuelP)
• build: fix clang 32 bits compilation (@Biswa96)