[C] Add support for custom ban file locations. Adds BUKKIT-4863

This PR allows users to change the location of the banned-players and banned-ips file via command-line options.

This PR adds new options to the OptionParser, "banned-players" & "banned-ips". These are then loaded in the PlayerList on initialization.

I have fully tested this PR by changing the location of the files and seeing if they still ban players/ips.

BUKKIT-4863: https://bukkit.atlassian.net/browse/BUKKIT-4863