Squashed 'packages/math-symbol-lists/' changes from 0d9147c..d11f74f

d11f74f Version 1.1
e8c8fb0 Base extended Unicode list on LUCR database
216b009 Add .dir-locals and update .gitignore
5631998 Add "left" to math-symbol-list-latex-commands

git-subtree-dir: packages/math-symbol-lists
git-subtree-split: d11f74fef06d93637e28f32e16edfb5b0ccd064d

Squashed 'packages/math-symbol-lists/' content from commit 0d9147c

git-subtree-dir: packages/math-symbol-lists
git-subtree-split: 0d9147c6f7432d7b7a1b7c7bba28165202c96d23