feat: update to Unicode 17.0

[Nerixyz]

Depends on #252 (this contains the same commits, so technically this could be merged as-is).

This updates to Unicode 17.0 (specifically the last commit). Unicode finally moved the files from https://www.unicode.org/Public/emoji/<version> to https://www.unicode.org/Public/<version>/emoji/ (see readme).

Some of the new emojis are skintone variations of already added ones. However, their base names are different, so find_map.php had issues trying to resolve parents. I added a command to generate this mapping explicitly ("! child -> parent").

[alexookah]

@jwheare
What about this PR? In the other PR for unicode 16 you mention about IRCCloud. Does this mean this will not be needed to get merged?

[jwheare]

This one will likely need to wait for implementations of the Unicode 17 emoji by Apple etc.

[iamcal]

James is right - I wont merge this until Apple have released their images.

[Nerixyz]

Updated to Twemoji v17.0.1. Waiting on Apple now.

[Nerixyz]

Added the images from macOS 26.4 beta 4 by extracting the font from the update image. I only added the new images. When running the extract.pl script, you get some weird combinations of components for older emojis. The new ones seem fine when scrolling through the diff.

[sashaweiss-signal]

Hi all! Thanks for maintaining this repo – we find it very useful. With macOS 26.4 now released, is there an estimate as to when Unicode 17 will be available here?

[mjankowski]

Curious about this as well -- is there another blocker now that 26.4 (and 26.5) are out, or just a matter of time?