[ticket/12030] Include config directory completly in update packages

When one of the config files was updated, we need to include all config files
because they are referenced relative from the files themselves.

PHPBB3-12030
[ticket/12030] Include adm/images/ when the css file was updated

The images are referenced relative from the admin.css file.
So when it was updated and the images where not, the updater will be without
images, unless we ensure that they are included in the update-package.

PHPBB3-12021
PHPBB3-12030
[ticket/12030] Fix wrong file and directory names

PHPBB3-12030
[ticket/12030] Fix some spelling issues

PHPBB3-12030
Merge pull request #1936 from nickvergessen/ticket/12030

[Ticket/12030] Include some directories completly in update packages