[Update v2.4.1547]StreamVR Input, clock widget, more categories of obj detection

** Sorry, the DEMO version hasn't been updated to this one. There is some issue in the DEMO version and we are fixing it. **

[Features]

• Support SteamVR Input
Now you can customize button settings yourself. You want to change the button of "show/hide main panel" function? Just do it.
• Clock widget
Yes, we provide a clock widget for you.
• Cat, dog, person and cup detection in ML Object Detection
It's a experiment feature and it's just for fun. You can turn it on to show your cat, dog, person or cup. (Vive/Vive Pro only)