* Working version of bcpl grammar.
Note, this grammar is very slow, requires a non-standard test driver, and is CSharp specific.
* Clean up grammar.
Remove useless parser symbols. Use assop rule.
* Remove Antlr anti-pattern.
Remove Antlr anti-pattern.
* Removed useless parentheses.
Removed parentheses that are unnecessary.
* Split of the grammar.
* Add lexer base class.
* Changes to hide ChannelsCommonTokenStream.
* Clean up.
* Ported bcpl grammar to Java target.
* Fixed semantics check for newlines. The lookahead must be screened for either default or the channel given when asking for lookahead or lookback.
