https://bugs.php.net/bug.php?id=75992
When plugins do time-limited bans and users enter stupid time values, a shitty bug in ext/date gets triggered, but only when reading the ban entries from disk. DateTime->format() is able to produce formatted strings which have more than 4 digits in the year, which are then considered invalid. This works around it by trying to parse a formatted version on the fly to ensure that it is valid.
This also cleans up and improves ban list loading and handling.
