WIP: refactor and humanize helicopter acceleration

Put a smooth function on top of velocity and
angular velocity for increased usability of
the helicopter mode.
stabilitze navigation against anisotropic screens

Signed-off-by: Simon Thum <simon.thum@igd.fraunhofer.de>
take an offset out of heli navigation input

This intends to increase usability by providing a small no-motion
area for the mouse or finger to rest.

This is highly tailored for our scenes and still needs
some knobs for potential other users!

Signed-off-by: Simon Thum <simon.thum@igd.fraunhofer.de>
Started implementation of a basic ssao shader.
.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	tools/packages.json
commented that NavType and Headlight are obsolete
borrow framework from Viewpoint.js
work on position, rotation, speed
refactoring, formatting, znear/zfar work
fixes, now seems functional
back to dev version
work on dynamic speed, fixes
fixed testfile
Added first SSAO attributes to Scene node;
Cleaned up code.
fixed condition in SFMatrix4f.getEulerAngles
fix
Handled modifications of the Color field in the ElevationGrid#fieldChanged method
Added copyright notice.
Added comments.