Fix ambient color settings for bzflag models

Refs #2291
Change bzflag to use new navigation system

Refs #2291
Fix threejs bounding box calculations. Standardize bounding box return value to use objects.

Refs #2040
Remove navigable behavior

Refs #2291
Fixes for using particles in threejs

Refs #2291
Fix collision detection between tanks. Clean up references to player objects.

Refs #2291
Clean up bzflag event handlers

Refs #2291
Update tank model to fix threejs texture issue

Refs #2291
Tweak tank camera position

Refs #2291
Fix particles so they don't show when they are behind part of the scene. Refs #2291
Switch bzflag config file to use threejs. Set standard navigation mode to "none".

Refs #2291