HyperMobs

Mythic items, signals, and an event for a mythic mob being hurt.

Added

• give mythic item <name> to <who>, and give <n> of mythic item ... for several. What does not fit is dropped at their feet.
• mythic item exists <name>.
• signal mythic mob <entity> with <text> sends a mob a signal its own skills can wait for.
• on mythic mob damage "<name>": runs when a mythic mob is hurt, with {_damage} and {_cause}; player is who hurt it, if a player did.
• drop mythic item <name> at <location> and all mythic items.
• mythic mobs within <n> blocks of <location>: the mythic mobs near a place, as creatures.