Ban based notification to other online moderators is the first form implemented by this PR.

With this update a new chat history definition is added on a per
room bases which allows operators to specify the number of chat
messages to store and present to the user on join.  Please see
the sample ini for room definitions.

When in none auth mode, registered users don't exist; hence the setting
makes the game impossible to join.

Normally the setting would be greyed out when the user is unregistered,
but commit 475c54bf introduced a new edge case where the stored setting
would apply to the field even if the user is unregistered, making the
setting possible to apply in no-reg mode. Regardless, any client could
have done this, not just the default cockatrice.

The server side fix should prevent all issues in the future.

Moved the RegOnlyRequirement functions out of the Database interface into the proper Server block of code.

See https://github.com/Cockatrice/Cockatrice/pull/1340 for details.

See https://github.com/Cockatrice/Cockatrice/pull/1340 for details.

Changed the default value for the client keep alive variable back to 1 (since that is what the setting is if the value is not found in the configuration ini file).

Syntax correction.