Add large hunspell dicts (#67424)

* Move en_AU alias to above declaration to match others

* Add en_GB-large, en_US-large, en_CA-large and en_AU-large hunspell dictionaries

Squashed commit of the following:

commit e3c0054263f6d71c1890ecb52b06ade71ce046ee
Author: Jai Flack <jaiflack@protonmail.com>
Date:   Tue Aug 27 18:38:34 2019 +1000

    Add en_GB-large, en_US-large, en_CA-large and en_AU-large hunspell
    dictionaries

    Squashed commit of the following:

    commit 6b16e7326061aa55bb6993b3913fb4fb701a9b8f
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:38:08 2019 +1000

        Adding en_GB-large dictionary

    commit c94c6c39503750c820cdab533b4372695b61bad3
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:37:37 2019 +1000

        Fix en_US-large and en_CA-large hashes

    commit 84a847b39e7ad967d26434b0f6935211bb42010a
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:15:54 2019 +1000

        Adding en_AU-large dictionary

    commit b7d6e1ceebae98a5d7f3c6e119cb3816b879ed54
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:15:36 2019 +1000

        Adding en_CA-large dictionary

    commit c1857a6e054b60bbe51eda4a8c3c55285cf6092e
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:15:10 2019 +1000

        Adding en_US-large dictionary

    commit 898caa0eb9452992d5dc59cd82d267fcc8ad1133
    Author: Jai Flack <jaiflack@protonmail.com>
    Date:   Sun Aug 25 15:14:25 2019 +1000

        Modifying mkDictFromWordlist to allow for different src and destination
        file names