* 3.1.x:
[ticket/13799] Split lines in HTML files for better readability
[ticket/13799] Add missing space before checked attribute
[ticket/13799] Correctly urlencode category and show selected avatar
[ticket/13799] Do not rawurlencode category in gallery avatar
Rather than showing the user an empty drop-down list for the local avatar
categories, inform him/her that there are currently no (local) avatars
available.
PHPBB3-10018
Implementing selection logic for gallery and remote avatars. Modified
some of the driver interfaces to make things work nicer also. Upload
functionality will be in the next commit.
PHPBB3-10018
This stubs out the avatar form fields and how form processing will
occur. Form processing is not yet implemented, but shouldn't be too
hard. After this I will refactor/duplicate some of the logic for the
ACP.
PHPBB3-10018