Add LaTeX code completion#4

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Taxyovio wants to merge 5 commits intoblach:masterfrom

Taxyovio:LaTeXCodeCompletion

Commits on Jun 13, 2019

Add LaTeX code completion
SuperTachyon
committed

Commits on Oct 15, 2021

Add mathrm in latex.json
Tachyon
committed

Commits on Feb 11, 2022

Auto end with more amsmath environments
Tachyon
committed

Commits on Mar 20, 2022