Add parsing support to ControlledString

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

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