Previously the parser would store intermediates as
a bit mask, which loses the order and, when matching,
makes any permutation of the intermediates match the
same sequence.

This commit changes that to record the intermediates in
the order they are used.

Store the intermediate (and, for CSI and DCS sequences,
the optional parameter character at the beginning of the
parameters) in one unsigned int, packed as much as possible.

Simplify the ESC, CSI and DCS matchers by using a combined
code of final character and intermediates.