Change some `wmem_packet_scope()` to `pinfo->pool`

As requested [here][1] by @eapache, help with removing calls to
`wmem_packet_scope()` in favour of references to `pinfo->pool`.

* Plugins chosen semi-alphabetically.
* When a calling function already has a `pinfo` argument, use that.
    * Remove `_U_` from its signature if it was there.
* If a function seems narrowly focused on getting and (possibly)
  returning memory, change the function signature to take a
  `wmem_allocator_t *`.
* If it seems more focused on packet-based operations, pass in a
  `packet_info *` instead and use `pinfo->pool` within.
* Some of the files in this MR still have references to
  `wmem_packet_scope()` where it would take significant work to remove.
  These will need revisiting later.

[1]: https://www.wireshark.org/lists/wireshark-dev/202107/msg00052.html

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