refactor wcclrun a bit, add formatting options: --tabs makes it output plain tab separated data, -l and -g control local / global token counts

So such lexemes are always left in the end.

Intentionally left implicit.

Rule - user-level class encapsulating WCCL rule.
Action - internal class for Rule's actions
ActionExecContext - helper class for execution of actions.

That forced antlr to run every time. The workaround is to remove the output directory
so files are generated from clean slate, thus have proper time stamps.