Sublime LC4 is an update to the Sublime LC3 syntax highlighting package, for LC4 16-bit assembly for Sublime Text 2 & 3.
Install:
download Sublime_LC4.sublime-package
Download and install AAAPackageDev.
In the folder Sublime-LC4 is the file lc3-assembly.JSON-tmLanguage which contains the editable JSON version of the grammar. Use AAAPackageDev to regenerate lc4-assembly.tmLanguage from this file.