Bug 15381: Remove getauthtypes and getauthtype

Bug 15381: Remove getauthtypes and getauthtype

These 2 subroutines are now not necessary anymore, we can use
Koha::Authority::Types to retrieve the authority types.

This patch won't be easy to test. Indeed, a lot of file are updated.
To test it I would suggest to focus on the merge authority

You should also confirm that the authtypecode and the authtypetext
values are correctly displayed when navigating in the authority module.

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com