Puts some colors in .g and .g4 ANTLR files and adds a simple build tool.
Make sure that you have the antlr4 alias and the Java classpath setup (as shown in antlr.org quickstart) for the build system to work correctly.
A simple method to install is to use Package Control. From the Package Control command palette, enter "Install Package" and then search for "ANTLR".
Please, go ahead and push even the smallest improvement.
WTFPL
See license