filter_sdh: combine skip_bracketed and skip_parenthesized

These two functions are almost exactly the same. The parenthesis variant
is essentially just a special case with more conditions to not remove
text. These can easily be combined together into one generic
skip_enclosed function to handle both cases. We also use char * instead
of char for the character comparison here since not everything is
neccesarily 1 byte and can fit into a char. This will be useful for the
following commits where we extend this logic further.

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