[ticket/11553] Move bulletin points to pseudo class

Move bulletin points for .linklist lists to pseudo class
Group pseudo classes for .linklist.bulletin and .icon-notification

PHPBB3-11553
[ticket/11553] Replace bullet with unicode

PHPBB3-11553
[ticket/11553] Typo

PHPBB3-11553
Merge pull request #1429 from cyberalien/ticket/11553

Move bulletin points for linklist lists to pseudo classes