Move the tag module files to their new homes (rename-only commit).

--HG--
rename : modules/tag/controllers/admin_tags.php => modules/tag/classes/Tag/Controller/Admin/Tags.php
rename : modules/tag/controllers/tag.php => modules/tag/classes/Tag/Controller/Tag.php
rename : modules/tag/controllers/tag_name.php => modules/tag/classes/Tag/Controller/TagName.php
rename : modules/tag/controllers/tags.php => modules/tag/classes/Tag/Controller/Tags.php
rename : modules/tag/helpers/item_tags_rest.php => modules/tag/classes/Tag/Hook/Rest/ItemTags.php
rename : modules/tag/helpers/tag_rest.php => modules/tag/classes/Tag/Hook/Rest/Tag.php
rename : modules/tag/helpers/tag_item_rest.php => modules/tag/classes/Tag/Hook/Rest/TagItem.php
rename : modules/tag/helpers/tag_items_rest.php => modules/tag/classes/Tag/Hook/Rest/TagItems.php
rename : modules/tag/helpers/tags_rest.php => modules/tag/classes/Tag/Hook/Rest/Tags.php
rename : modules/tag/helpers/tag_block.php => modules/tag/classes/Tag/Hook/TagBlock.php
rename : modules/tag/helpers/tag_event.php => modules/tag/classes/Tag/Hook/TagEvent.php
rename : modules/tag/helpers/tag_installer.php => modules/tag/classes/Tag/Hook/TagInstaller.php
rename : modules/tag/helpers/tag_rss.php => modules/tag/classes/Tag/Hook/TagRss.php
rename : modules/tag/helpers/tag_task.php => modules/tag/classes/Tag/Hook/TagTask.php
rename : modules/tag/helpers/tag_theme.php => modules/tag/classes/Tag/Hook/TagTheme.php
rename : modules/tag/models/tag.php => modules/tag/classes/Tag/Model/Tag.php
rename : modules/tag/helpers/tag.php => modules/tag/classes/Tag/Tag.php
rename : modules/tag/css/tag.css => modules/tag/media/tag.css
rename : modules/tag/views/admin_tags.html.php => modules/tag/views/admin/tags.html.php
rename : modules/tag/views/tag_block.html.php => modules/tag/views/tag/block.html.php
rename : modules/tag/views/tag_cloud.html.php => modules/tag/views/tag/cloud.html.php
Fix the tag module class declarations.
Add the tag module transparent-extension-enabling files.
Search and replace in tag module (273 places).
Merge pull request #242 from shadlaws/k3_tag_module_translate

K3 tag module translation.