Introduce shortcode/template combination to render avatars in chat.php
Changes:
- Add chatbox_menu_template.php and chatbox_menu_shortcodes.php files.
- Add bootstrap3 styling for some elements in chat.php list view markup.
- Cleanup chat.php and chatbox_menu.php code generally and to replace legacy database calls with current standard.
- Add logic to search and replace legacy chat icon source path with current icon path in $CHATBOXSTYLE
- Refactor retrieveUserDataByNick() method to use e107::user() method to retireve extended user data.
Succeeded Tests:
- Load chatbox_menu_template.php in {e_PLUGIN}/chatbox_menu/templates/chatbox_menu_template.php
- Load chatbox_menu_template.php in {THEME}/templates/chatbox_menu/chatbox_menu_template.php
