remove --incr-decr-operators and --no-incr-decr-operators

instead, add eight fine-grained ones:
--pre-incr-operator | --no-pre-incr-operator
--pre-decr-operator | --no-pre-decr-operator
--post-incr-operator | --no-post-incr-operator
--post-decr-operator | --no-post-incr-operator

all are enabled by default