Add support for rainbow and rainbowme commands and /html

[RGBCube]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

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[RGBCube]

Can confirm it works now:

Have also tested it with /html for a <details>, worked well.

[RGBCube]

cc @ajbura can we get this in soon? this was a continuation of an older PR and the code has attribution

[ajbura]

Hey, @RGBCube currently the rainbow commands renders the raw html if you put any other formatted text in your message. Also if we use the plain text only to generate the rainbow html we will loose the formatting entirely which will create another issue. So I think we probably need to tweak the algorithm so it can process html without breaking it?

[RGBCube]

Hey, @RGBCube currently the rainbow commands renders the raw html if you put any other formatted text in your message. Also if we use the plain text only to generate the rainbow html we will loose the formatting entirely which will create another issue. So I think we probably need to tweak the algorithm so it can process html without breaking it?

Ah, yeah I hadn't thought of that. It would be easy to simply ignore any markdown and send as-is, or we could treat it as a dom and recurse inwards. I think the latter is better, I'll try to tackle it.