Define $context['stable_icons']
and add a hook for CRUD it.

Signed-off-by: Suki <suki@missallsunday.com>
Use $context['stable_icons'] on SSI.php

Signed-off-by: Suki <suki@missallsunday.com>
Use $context['stable_icons'] on Display.php

Signed-off-by: Suki <suki@missallsunday.com>
Use $context['stable_icons'] on MessageIndex.php

Signed-off-by: Suki <suki@missallsunday.com>
Use $context['stable_icons'] on Recent.php

Signed-off-by: Suki <suki@missallsunday.com>
Use $context['stable_icons'] on Search.php

Signed-off-by: Suki <suki@missallsunday.com>
Need to globalize $context

Signed-off-by: Suki <suki@missallsunday.com>
Merge pull request #2103 from MissAllSunday/stable_icons

Stable icons