* Add VoxiGen to Voxel Editors
* Place VoxiGen after Voxelle Desktop (alphabetical order)
* Update moved links: Bullet, Chipmunk2D, Horde3D, KorGE, Supernova, Tiny Physics Engine, indiegames
Each old link no longer resolves (404 or no answer); each new one is the
project's own current home and answers 200.
* Spell KorGE as the project does; Three.js before Tiny Physics Engine
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Co-authored-by: Ellison <ellisonleao@gmail.com>
