fix: buckets bypassing Disable-Other-Break

[MrNickax]

Problem

Disable-Other-Break: true does not protect liquids. Players can still drain water and lava out of protected worlds/regions by picking the source block up with a bucket.

Picking up a liquid fires PlayerBucketFillEvent and removes the source block directly — no BlockBreakEvent is ever fired. RegenerationListener only listens to BlockBreakEvent, PlayerInteractEvent (trampling) and PlayerHarvestBlockEvent, so the bucket path never reaches RegenerationEventHandler and none of the protection checks run.

Reproduce

1. Use-Regions: true, Disable-Other-Break: true.
2. Create a BlockRegen region containing water, with no preset configured for WATER.
3. Overlap it with a WorldGuard region that has block-break: allow (so WorldGuard does not deny it itself).
4. Break a stone block inside the region → correctly denied.
5. Right-click the water with an empty bucket → the source block is removed.

Fix

• New RegenerationEventType.BUCKET_FILL.
• RegenerationListener now handles PlayerBucketFillEvent and routes it through RegenerationEventHandler like any other break, so bypass, data check, world/region scope, blockregen.region / blockregen.block permissions and Disable-Other-Break all apply.
• checkProtection treats BUCKET_FILL like BLOCK_BREAK for WorldGuard and Residence, so those plugins keep handling the blocks they protect.
• Bucket fills are protected but never regenerated: the server clears the source block after the event, which would fight with a regeneration process. When a preset does exist for the liquid, the handler returns early and leaves the fill to vanilla.
• Documented the liquid case on Disable-Other-Break in Settings.yml.

Notes

• PlayerBucketFillEvent and getBlockClicked() exist across every supported API version, so this needed no version module.
• Behaviour is unchanged when Disable-Other-Break is false, outside enabled worlds/regions, and for players with bypass.
• PlayerBucketEmptyEvent (placing liquids) is intentionally left alone — that is placing, not breaking.