Normalize up vector of Camera's rotateView to avoid round / cummulative errors

[Forchapeatl]

Increasing access

Some new issues were introduced in the refactored code.
#7598
The updated up vector should be normalized to avoid cumulative rounding errors.

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

The up vector of p5.Camera.tilt() will be normalized.