nim-emacs-module VS ffipf

The original template and helpers for writing Emacs modules in Nim is here: https://github.com/yuutayamada/nim-emacs-module but it doesn't work with modern Nim versions, so I had to fix it a bit. That repo seems unmaintained, unfortunately.

Thanks :) Judging by the upvotes there is some interest in the module like this, so I'll keep working on it. It'll take some time before it's usable by others, I think I should be able to clean up the code and write a better Elisp wrapper in a week or two. I used Ivy for displaying candidates because it was by far the easiest integration: literally 1 line of code (https://github.com/piotrklibert/ffipf/blob/master/elisp/ffip.el#L41), but I'm more used to Helm, so integration with it will definitely come next. I don't use Selectrum/Prescient/Embark/etc. personally, but I don't think writing integration with them would be hard. The main selling point of this module is that it's synchronous yet still fast enough, so there's no need for implementing async behavior when integrating it with a framework.