Support arbitrary unicode symbols

[tristan957]

https://unicode.org/Public/UNIDATA/UnicodeData.txt
http://www.unicode.org/Public/UNIDATA/NamesList.html

I have long thought about maybe trying my hand at doing something with this + telescope.

[boydkelly]

I just copied the UnicodeData.txt url to open a feature request and here it is already. But a year later. It would be super nice to add unicode to this plugin. Were not just searching for emojis but serious grammer and language apps and users need to search for various ɛ ɔ ɲ etc. unicode.vim is not working well with modern lua configs.