Implementing "include" functionality using ANTLREdit

As of changeset 3834 in the ANTLR examples repository, the C example shows how to use the new built-in stream stacking functionality in the C target to implement "include" functionality.

Note that ANTLR 3.0 does not include the stream stacking support. Any version after changeset 3839 should be fine, or ANTLR 3.0.1 when it is released (not yet released at the time of writing, 20 June 2007).

This supersedes the previous method (see 'Manually implementing "include" functionality using ANTLR').