Initial Leap Support (Orbit Camera One Hand Mode)

Move the hand in x direction to rotate the model around the upward axis,
pitch and roll of the hand control the corresponding angle of the model
Update release date estimate in README
Merge branch 'master' of github.com:acgessler/open3mod
Fix setting of light direction.
Tweak ambient lighting.
Make light source rotateable (move mouse while having the right  mouse key pressed).
Configurable light intensity / brightness.
Add setup project with basic setup flow.
Setup: use relative paths.
Setup: add EULA/license file.
Change copyright info to "Open3Mod Contributors", add Contributors file.
Merge with acgessler/open3mod/master