Construct 3 - 3D effects

Demo - drag and drop the 3DShapes and the Cleric.

Combined Effects:

• Fragment 8 light
• Directional light
• Depth Fog
• Height Fog
• Screendoor transparency

Support for one or eight 3D world based lights, directional light, fog, screendoor transparency, works on 3DShape, 3DObject and some 2D objects. Tilemap not supported (first shader is tilemap fragment shader).

Usage notes:

• It must be the first effect on the 3DShape or 3DObject
• Currently 3DObject will only work with webGL23DObject Now supports webGPU also, but requires some CPU perf to make it work with 3DObject.
• To set spotlight cone angle, in the effect parameter Spot cos(angle) value, set it to cos(spotlight angle). The reason to set this as a parameter is so we don't need to calculate cos(angle) for every fragment to save performance. The value should be around 0.9 or so for a fairly tight spotlight.
• The spotlight direction should be a unit 3 element vector which points in the direction of the cone of light (with z of -1 pointing away from the default viewport, without moving the camera)

This effect requires the main.js file from the example project to be included in other projects using this effect, it patches the runtime engine to enable this effect.  CAUTION - this may mean this effect could become non-functional in future versions of C3. We will work to make sure this does not happen and we have requested for these changes to be incorporated into the C3 engine, so it will not be an issue in the future.

Development notes: 

• *DONE* 8 light versions to come next
• *DONE* Working on webgpu patch for 3DObject to work with lighting
  
• *DONE* Request changes to C3, so that the main.js changes will not be needed.
• C3 implement the requested changes above.