light.js + material.js: replace console.warn with Friendly Error System (FES)

[MASTERsj01]

Increasing access

Using p5._friendlyError() ensures lighting and material warnings are displayed consistently and can be suppressed via p5.disableFriendlyErrors.

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

Feature enhancement details

light.js uses 6 console.warn and material.js uses 3 console.warn instead of p5._friendlyError():

light.js (6 calls):

• Lines 1236, 1243, 1250: lightFalloff() negative value warnings
• Line 1260: lightFalloff() all-zero arguments warning
• Line 1639: spotLight() wrong argument count
• Line 1671: spotLight() concentration < 1

material.js (3 calls):

• Line 2074: textureMode() invalid mode
• Line 3281: blendMode(DARKEST) unsupported in WebGL
• Line 3294: blendMode(LIGHTEST) unsupported in WebGL

I have a PR ready.