MinePiece: Void Century

# Changelog — ver4.6

Fixed: Raids vanished in the middle of the fight. A raid's enemies were ordinary mobs, and Minecraft deletes those on its own once you walk a little away; with the field empty the raid gave itself up as lost. They are marked permanent now, and a raid waits for an enemy that is merely outside the loaded chunks instead of giving up on it — while an enemy that truly ceased to exist is dropped, so the field can still empty and the boss still arrive.

Added: `/gamerule lostcenturyRaidPersist`, on by default, which is the switch for the above.

Changed: Onigashima fights in named waves: the rank and file, then the Tobi Roppo together, then the All-Stars together, then Kaidou and Big Mom. Each wave waits for the one before it to fall.

Added: Turning Gear 5 on heals half of your full health — counting the ten hearts Gear 5 itself adds.

Fixed: Knockback Attack had left the cycle of the reworked characters — Rocks, Roger, Garp, Mihawk and Shanks. The plain free attack is the first stop again.