5.2.3 alpha

added: configuration option "ignoredheadnames" which is a list of head names that PlayerHeads will avoid modifying, detecting, or otherwise interacting with. Slimefun heads ("CSCoreLib" heads) are now ignored by the plugin by default to avoid breaking custom items from that plugin.
added: configuration option "ignoredheaduuids" which is a list of head uuid strings that PlayerHeads will avoid modifying, detecting, or otherwise interacting with.
Note: at this time, the reload and config commands do not affect currently blocked heads - this requires a server reload. this will be resolved in a future version.

API: there are no significant API changes since 5.2.0