Update to latest ANTLR libraries

v1.2.0

Bump version, update changelog, update build config

test_not

Currently, test_not can only be used in combination with AST-and-session-agnostic functions that only check on the student's code, such as test_student_typed.

check_file SCT

NOTE: highlighting when running SCT w/ multiple files is not yet implemented

fix: allow base State to work with AST checks

dummy parser now returns its ParseError by default

Slight tweak to AstModule for better subclassing

parse argument to AstModule is now optional, so you can override parse method

AST parsing and selection

This release pulls in sqlwhat's AST parsing code, and adds classes to plug an arbitrary AST generator into *what libraries.

add simple scts test_mc, success_msg

v0.2.0

Update __init__.py

Pull all but dispatcher from sqlwhat

v0.1.0

bump minor version