Paint "v3" 2018-01-21 "Middle Safety"

Test release using v3 Paint scene; utilizes a safety pinch heuristic that focuses on the middle knuckle bone's angle relative to the index finger.

The DevGui is populated with some settings as well.

Build:
https://drive.google.com/file/d/0B_w9_hQJupIYMnhvVDk2emgzcTQ/view