Small improvements and bug fixes August 2024

[KaliedaRik]

TODO - list achievements

• Internal tidying: Remove Object.freeze() and Object.seal() from the code base
• Bugfix: demo Filters-019
• Internal tidying: relocalise non-shared constants
• Documentation: broken link fixes for particle-related factories
• Internal tidying + documentation: remove all mentions of promises as part of the display cycle
• New OKLCH-based filters: rotateHue and negative
• New OKLAB-based filters: modifyOk and modulateOk
• [BREAKING CHANGE] HSL-based blend filter options now use OKLCH[1]
• [BREAKING CHANGE] Recode reduce-palette filter to use OKLAB, more efficient grayscale option, etc
• [NEW ISSUE] - In the reduced-palette filter, Safari browser does not like named color strings - eg: red - in a palette defined as an array of color strings, but seems happy to process structured color strings - eg: rgb(255 0 0). Documented issue, but Won't Fix.

[1] - while this means the affected filter options are substantially slower than previously, the improvement in output is (in my view) worth the cost.

Option	Old	New
hue
luminosity
saturation
color