Fixed visualization blocks being hidden under snow.
Redesigned per-world claim mode configuration.

Much easier to understand and customize, especially for server owners
who are new to GP and have both survival and creative worlds.  Also, a
performance improvement - when claim creation is disabled in a world, GP
will not protect any existing claims in that world.
Added /IgnoreClaims advertisement to animals.

For both attacking and right-click interaction.
Version to 8.5