Reverse engineered source code for issue #50

[sgparry]

This is a full set of reverse engineered source code to fix issue 50. (missing source code for ANTLRAntTask-1.1 and ANTLRAntTask-1.2).

Obviously, this pull request should not be applied. Hopefully you have the genuine code and will post that instead.

I have generated and submitted this for three reasons:

• in case you have lost or are unable to post the real source code
• to provide stop-gap code until the real code is posted, allowing other developers to work on the plugin, e.g. to adapt it to newer versions of ANTLR4.
• to indicate possible location/layout for the missing code.
  The reverse engineered code was created by studying the decompiled 1.1 or 1.2 code, applying corresponding changes to the 1.0 code base and then verifying that a decompile of the patched code matched the decompile of the 1.1 / 1.2 code. Line numbers were checked as well as program statements.