statusbar item that shows users and limit info in channels
changes:
added setting _show_details_oper and supporting code
added setting _format_sep and supportingf code
added setting _format_div and supporting code
added setting _group_begin and _format_group_end and supporting code
added setting _format_mode_oper, _format_mode_op, _format_mode_ho, _format_mode_vo and _format_mode_other, and supporting code
added settting _show_warning_limit_difference and supporting code (changing _show_warning_limit_percent behavior)
changed default of _show_warning_limit_percent from 95 to 0