This does a bunch of structural cleanups to make the code better

Added a new test file, which tests how the body-inline multi-flags work

Pass to do some cleanup

Fixed an issue, after a while away
Get to a known state

All of the places that parse controls now use ControlledString instead
of doing their own stuff. -\(o-o)/-

ControlledString now has support for parsing out control strings. Need
to come up with something so that ReplPair can use it as is, instead
of having its own implementation; plus, there are a few other
interesting things I can think of that could be added to
ControlledString
* named arguments to controls is one
  * multiple named arguments
* store controls in controlled string by name instead of as ordinals

This is part one of factoring out controls and control parsing so that
we aren't doing it in three different places.

Two main things before this is done:
1. Finish up the parsing in ControlledString
2. Actually replace the old implementations in ReplPair