Split ruleset manipulation functions out into pf_ruleset.c to allow them to

be imported into pfctl. This is a precursor to separating ruleset parsing
from loading in pfctl, and tons of good things will come from it.

2 minor changes aside from cut-n-paste and #define portability magic:

- instead of defining the global pf_main_ruleset, define pf_main_anchor
  (which contains the pf_main_ruleset)

- allow pf_find_or_create_ruleset() to return the pf_main_ruleset if it's
  passed an empty anchor name.

ok henning dhartmei

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