merge: Convert Address to use TAILQ

merge: Convert Address to use TAILQ

 * Define an AddressList structure using TAILQ
 * Add functions to convert to/from Address/AddressList
 * Use AddressList in mutt_addrlist_dedupe
 * Use AddressList in mutt_addr_parse_list
 * Const'ify parameter to mutt_addr_copy
 * Implement mutt_addresslist_new
 * Use AddressList in mutt_addr_copy_list
 * Use AddressList in mutt_addr_free, implement mutt_addresslist_free_one
 * Use AddressList in mutt_addr_remove_from_list
 * Use AddressList in mutt_addr_qualify
 * Use AddressList in mutt_addr_append
 * Use AddressList in mutt_addr_cmp_strict
 * Use AddressList in mutt_addr_has_recips
 * Use AddressList in mutt_addr_search
 * Use AddressList in mutt_addr_remove_xrefs
 * Tidy Address free'ing functions
 * Use AddressList in mutt_addr_write
 * Use AddressList in mutt_addrlist_to_intl and mutt_addrlist_to_local
 * Convert mutt_addr_remove_from_list and mutt_addr_remove_xrefs API to AddressList
 * Convert Alias to use AddressList
 * Convert Envelope addresses to AddressList
 * Fix variadic function
 * Fix recursive alias lookup
 * Cleanup Address API: mutt_addr_cmp_strict -> mutt_addresslist_equal
 * Cleanup Address API: parse and free
 * Cleanup Address API: mutt_addresslist_qualify
 * Cleanup Address API: mutt_addr_write
 * Fix and refactor mutt_is_list_recipient and mutt_is_subscribed_list_recipient
 * Fix match_user
 * Cleanup Address API: unexpose mutt_addr_is_(intl|local)
 * Cleanup Address API: unexpose mutt_addr_mbox_to_udomain
 * Cleanup Address API: mutt_addr_remove_from_list -> mutt_addresslist_remove
 * Cleanup Address API: mutt_addr_remove_xrefs -> mutt_addresslist_remove_xrefs
 * Cleanup Address API: unexpose mutt_addr_set_(intl|local)
 * Cleanup Address API: mutt_addrlist_dedupe -> mutt_addresslist_dedupe
 * Cleanup Address API: mutt_addrlist_to_(intl|local) -> mutt_addresslist_to_(intl|local)
 * Remove "next" pointer from struct Address: conversion to TAILQ is complete
 * Merge AddressNode into Address
 * Rename mutt_addresslist_* to mutt_addrlist_*
 * Provide mutt_addrlist_append and mutt_addrlist_prepend
 * doxy: fix comments
 * test: update basic address tests
 * remove 'mutt_' from static functions
 * Add tests for mutt_addr_cmp
 * Add tests for mutt_addr_cat, explain what it does does in the Doxygen block
 * Add tests for mutt_addr_copy
 * Add tests for mutt_addr_free
 * Add tests for mutt_addr_valid_msgid
 * Add test for mutt_addrlist_append and mutt_addrlist_prepend
 * Add tests for mutt_addrlist_copy
 * Add test for mutt_addrlist_dedupe, fix mutt_addrlist_parse
 * Run clang-format over test/address
 * Add tests for mutt_addrlist_equal
 * Add tests for mutt_addrlist_free_all
 * Add tests for mutt_addrlist_free_one
 * Add tests for mutt_addrlist_free
 * Boolify uses of Address' group
 * tidy code
 * Revert queue.h formatting
 * Rename mutt_addrlist_has_recips to mutt_addrlist_count_recips and add tests
 * Kill duplicate copyright line
 * Rename mutt_addrlist_free_all into mutt_addrlist_clear, remove freeing functions
 * Add tests for mutt_addrlist_count_recips
 * Add tests for mutt_addrlist_parse + slight refactor and fix return value
 * Slightly refactor mutt_addrlist_parse2
 * Avoid leak in the test for mutt_addrlist_parse
 * Add tests for mutt_addrlist_parse2
 * Add tests for mutt_addrlist_qualify
 * Sort address functions by name
 * Add helper to create and populate an Address, avoid leaks in tests
 * Simplify mutt_default_from
 * Add tests formutt_addrlist_remove_xrefs
 * Add tests for  mutt_addrlist_remove
 * Add (basic) tests for mutt_addrlist_to_(intl|local)
 * Add tests for mutt_addrlist_write + make it more readable
 * Fix test for mutt_addrlist_write and avoid leak
 * Add mutt_addr_to_local
 * Test addresses with comments in mutt_addrlist_parse
 * Run clang-format over test/address