Fixed namespace of textures examples
first tests with Anaglyph3D
Fix so it works on my GPU too
Now with textures and red/cyan
More functionality in Anaglyph3D.cs

- added a frustum method (however, doesn't seem to work)
- some more methods in Anaglyph3D.cs (easier handling in other classes)
- convergence plane is movable
Added ColorMask to Fusee.Engine.Imp.WebGl.js
(Anaglyph3D is now working in browser)
Updated submodule to latest JSIL
Readded brightness value to shader