new emoji completions!

[rokke-git]

happy april fools! it's that time of year again‼️

this pr combines changes from #61391 and #60263 into one single update. it:

• updates emoji completions to include v1️⃣6️⃣.0️⃣.0️⃣
• adds completions for combining emoji 🇳🇱
• enables reverse searching latex strings like \?arrowTab

many of the text arrows updated to the \ufe0f version already had a latex version, added \*blackarrow to mimic \*whitearrow and new \curvearrow*s for the remaining ones

solves #56935

[rokke-git]

(size threshold increased since this takes manual/unicode-input from 778.23 to 965.54 KiB)

[rokke-git]

significantly reduced the extra stuff I was adding in here. been playing around with the added combining names from enabling multi-character emoji and it basically solves the problem that I was trying to fix with the splitting syntax I had. adding \zwj fixes the help text so the extra stuff there isn't really needed.

I kept the latex reverse-lookup since we really do have a lot of arrows and almost none of them start with the word arrow. I took out the splitting there as well to make things simpler, especially since the behavior is a tad confusing if you have multiple search strings and you happen to get results whose first letter all match

the real diff summary is something like +26 -12