Add ability to bypass flight flag.

Currently, whenever you enter or exit a claim, flight is being reset (unless claim has `Flight` flag set to `true`), which is slightly annoying.

I just copied the logic from your `canCrossBorder` method (haven't found where `hasBypassPermission` method implemented, so **it is a blind copy-paste essentially**) and the idea of having able to let some users, whether it is by trust list or permission sounds very convenient.