Implemented .split() and .rsplit() for ANSIString. Props to the PyPy team.
Adjustments for getting interleving ANSI codes in splits, slices, and indexes.
Resolves #482. ANSIString splitting and slicing more sane.
Whoops, overcorrected some of that for split().
Fixed some issues with counting characters in ANSIString. A first version of Evtable that works with ansi.