Allow certain specified ranges to bypass protections

[marijnvanwezel]

This pull request, when merged, allows an administrator to specify certain IP-ranges that can bypass the restrictions imposed by CrawlerProtection. This can be useful to e.g. allow internal networks or crawlers coming from certain tools.

The administrator can specify a number of IP-ranges to allow using $wgCrawlerProtectionAllowedIPs. For example:

$wgCrawlerProtectionAllowedIPs = [ '192.168.0.1' ]; // Allow only 192.168.0.1
$wgCrawlerProtectionAllowedIPs = [ '10.0.0.0/8', '172.16.0.0-172.31.255.255', '192.168.0.0/16' ]; // Allow local connections
$wgCrawlerProtectionAllowedIPs = [ '13.52.5.96/28' ]; // Allow some monitoring tool