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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
