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306014adc7
This is ported over from an old forgotten branch I'd deleted, then
thankfully managed to dig up again. 😅
Instead of making GroupCommand contain child commands, use a flat array
for commands and implement groups as GroupStartCommand and
GroupEndCommand. This makes it much simpler to iterate the commands
list in order to jump to labels.
Then implement those labels and the commands that use them: b, t, and T.
Also add the s SubstituteCommand, and combine the code for the q and Q
commands.