Implement OpenVR watcher

[ErikBjare]

The current state of logging what is done is VR is horrible. RescueTime stops logging completely when mouse & keyboard input stops and since the window doesn't have to be in focus when in VR it likely wont in the short-medium term.

Should be easy enough, there are Python bindings here: https://pypi.python.org/pypi/openvr

[ErikBjare]

The relevant part of the OpenVR API should be here: https://github.com/ValveSoftware/openvr/blob/e1507a27547d22a680153862865d40b90fad8c75/headers/openvr.h#L1364

It seems like the Python bindings for OpenVR aren't complete. May need to fork and extend.

Edit: My bad, the Python bindings for OpenVR seem very complete.

[ErikBjare]

There also seems to be a useful event called SceneApplicationChanged: https://github.com/ValveSoftware/openvr/search?utf8=%E2%9C%93&q=VREvent_SceneApplicationChanged&type=Code

[ErikBjare]

Would be cool to write this watcher in Rust.

There is both:

• https://github.com/lucidscape/openvr-rs
• https://github.com/rust-openvr/rust-openvr

First we'd need a client library however.

[ErikBjare]

I started something small here: https://github.com/ActivityWatch/aw-watcher-openvr

[ErikBjare]

Closing this, any further discussion would be best done in the repo itself.