[dev] Kronolith patch - color + category

[Jan Schneider]

Zitat von Joel Vandal <jvandal@subi.to>:

> I have some idea for a new application category system for Horde :
> 
>  - A new class for category management for each application (like :
> lib/CategoryUser.php)

I like to see the categories being shared across all Horde applications, but
as I know that some people will disagree, it probably would best suit our
needs if you can select if a category should be shared or local to an
application.

Jan.