Replace `JSONFromMarkup` with `parseInstruction`
Replace `JSONFromMarkup` with `parseInstruction`

This little method applies our parse map to markup command (one group
inside a pair of semicolons).

When we hit a match, we return the applied `t` result from the match. If
we dont hit a match, throw.

iFixit/node-markup,iFixit/node-markup,iFixit/node-markup