This should satisfy #525

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Feature essentially done.

Implemented:

• Lsp
  • Texlab (Recommended)
    • All features currently provided as documented by texlab
• Builders/Compilers
  • Tectonic (Recommended)
  • latexmk
• PDF Viewers
  • okular
  • zathura
  • sioyek
  • qpdfview
• Forward search
• Formatter

Not implemented:

• Inverse search
  • Not planned as widely different between pdf viewers and configuring through nix might not even be possible for some (at least not easily) (okular...).
  • Sioyek does have inverse search support via cli args and (should) be working properly with default values.

Due to the scale that this language implementation ended up being I organized it differently compared to the other languages; it is in multiple files and modules, all called by a default.nix in a tex directory. The implementation of the second largest language is more that 5 times smaller and I felt like a single 1500 line file wasn't ideal and the current implementation was a more appropriate approach.

I have not tested every single combination of options as that would take forever. I have tested many of the more relevant ones but I have not tested the texlab experimental settings for instance.

The config I am currently using is as follows:

settings.vim.languages.tex = {
  enable = true;
  lsp.texlab = {
    forwardSearch.enable = true;
  };
  build = {
    builders.tectonic.enable = true;
    forwardSearchAfter = true;
    onSave = true;
  };
  pdfViewer.zathura.enable = true;
  extraOpts.texFlavor = {
    enable = true;
    flavor = "tex";
  };
};

I have created frameworks for easily adding both new pdf viewers and new tex builders/compilers. Adding other LSP servers should be not too complicated if texlab proves to be fundamentally inadequate.

Overall, this implementation will cover all of my needs for tex and includes many other features I will likely not use but have been implemented to achieve near feature parity with many of the implemented programs which will hopefully cover most of what anyone else requires. If not, in a few places I added methods to be able to add custom configuration just in case.

There are no other features I plan to add for the time being, but I will try to fix bugs as they come up on my side.

Looks good from a first glance. Thank you for your hard work.

I'm too tired to review in full at the moment, but I'll properly review tomorrow when I wake up. One thing that comes to mid is that mkEnableTreesitterOption could probably be put into the extended library, so that other modules can use it as well.

If you could also fix the Cı errors by then, that'd be great.