Tries to switch to antlr4ng and antlr-ng parser WIP

[anderson4j]

Would be nice to not have an old built-in ANTLR4-c3 package in the repo. Looks like antlr4-c3 is TS now, so think we should be good to swap.

Saw that antlr-ng is developed by the same guy who makes antlr4-c3 (and the readme says "antlr4-c3 The antlr-ng and ANTLR4 Code Completion Core", so I thought it could be nice to swap to this as well.

My quick try of it needed a bunch of minor changes for small changes to how things work/are named.

Biggest issue seems to be that antlr-ng produces parser with "EOF" tokens, while it seems the library uses "cEOF" for the same purpose?

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