feat: Initial enabling of 3D

Turns on 3D viewer when needed; implements tetrahedron command. Still
   quite several commands remaining for first test construction
   (from Rostamian's incenter.html) to work.

etc/deps/GeoGebra/HTML5/5.0/web3d/deferredjs/1ACC6399F984FD07A949D6F3D28D2FA3/14.cache.js

@@ -0,0 +1 @@
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