Complete the SableCC 4 grammar.

Signed-off-by: Etienne M. Gagnon <egagnon@j-meg.com>
Fix import statements.

Signed-off-by: Etienne M. Gagnon <egagnon@j-meg.com>
Ignore generated files.

Signed-off-by: Etienne M. Gagnon <egagnon@j-meg.com>
Migrate code to SableCC 4-beta.2.

Signed-off-by: Etienne M. Gagnon <egagnon@j-meg.com>