Add Hex Text Compatibility to Angelica

[KAMKEEL]

This is a continuation of the RGB Support to Angelica based on these PRS:
#1064 #1070

Repo: https://github.com/KAMKEEL/HexText/tree/main

This is a snippet from the README on Hex Text

Direct RGB colours

HexText recognises two RGB-focused syntaxes that let you move beyond the vanilla palette:

Inline hex colours

Use &#RRGGBB (or §#RRGGBB) to immediately switch to an exact RGB colour (for example
&#ff8800). The change takes effect from the character immediately following the code and clears any
nested colour spans that were active before it.

Scoped hex spans

Wrap a section of text in <RRGGBB> ... </RRGGBB> to apply a colour until the matching closing tag.
These spans can be nested and work alongside inline hex codes. Closing a span restores the previous
colour, making it easy to temporarily highlight text without permanently overwriting the stack.
Servers can disable these HTML-style tags if they want to restrict formatting to inline codes.

Both syntaxes accept upper- or lower-case hexadecimal digits.

Special effects

In addition to vanilla style toggles, HexText adds four extra effect codes. Like other formatting
codes they can be written with either & or §:

Token	Effect
&g	Enables the animated rainbow shader. Use &r to clear it.
&h	Flips the text upside-down (Dinnerbone effect).
&i	Adds a fiery ignite overlay to the text.
&j	Applies a subtle shake/jitter animation.

Effects remain active until the renderer resets them. Any explicit reset (&r) or colour-stack
change (such as applying a new colour or closing a <RRGGBB> span) clears the effect, so place the
code after the colour you want it to animate.

[slprime]

For more information: §h and §x are used as technical markers in CodeChickenCore (NEI hints)

[KAMKEEL]

For more information: §h and §x are used as technical markers in CodeChickenCore (NEI hints)

Does it use String Replacement when locating those characters?