#44 Conference list color coding

[Jepson]

[Suggested by Hokie in (578636)]

Color code the conferences in the conf list, to
distinguish between

- public conferences
- private conferences
- secret conferences (which the user is allowed to see,
due to either being a member or having admin privileges)

[Jepson]

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[from mneck]

In much the same way, of course, the conference list should
display "(private)" after private/exclusive conferences
and "(hidden)" after hidden conferences.