Rework how list mode limits are parsed and applied.

- Keep one list of all limits in ServerLimits instead of one in
  each list mode. This should reduce memory usage slightly and the
  lists are usually so small and are compared so infrequently that
  this won't cause any performnace issues.

- Automatically look up the mode limit when the mode list is used
  instead of manually rehashing in each module. This should cause
  less footguns than the old API and doesn't require manually
  updating the limit on rehash.

- Move code relating to variable and lower limits from the core to
  core_channel. This is only used by ISUPPORT.

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