Converts LaTeX tags to unicode: \mathcal{H} → ℋ

Ported from unicodeit as a Clojure library with no dependencies.

• bb test passes
• Interactive, open a bb repl:

(require '[latex2unicode :refer [latex2unicode]])
(latex2unicode "\\int_0^\\infty e^{-x^2} dx")  ;=> "∫₀^∞ e^{−x²} dx"

This library is a Clojure port of svenkreiss/unicodeit by Sven Kreiss, Kyle Cranmer, and contributors. The LaTeX→Unicode symbol table in src/latex2unicode/data.clj was derived from that project.

• Code: MIT (see LICENSE).
• Symbol data: LaTeX Project Public License v1.3c (see LICENSE.LPPL), inherited from the upstream unicodeit data which was itself derived from LaTeX packages.