printing: refactor if and loop code

The loop code was buggy: the current position was only increased
inside when executing the loop once. This would obviously fail
for empty lists. Moreover, the whole thing was quite difficult
to reason about, since a reference to the current position was
passed down in the call hierarchy.

Instead, pass from and to values to the parse function and
create a generic function that can search for the end of
loop and if blocks. This function handles nested if and for
loops.

The if-code now formats the block only if the condition is true.
The old code would format the block and throw it away if not
needed.

This should now provide better diagnostics for mismatched tags.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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