[added] Arrows will have special collision effect with filled bucket

[mugg91]

Description

This adds logic to Arrow.as in doesCollideWithBlob() in case an Arrow is about to collide with a filled bucket.
If so, it checks some conditions.

The conditions:

• arrow is of the type normal or fire
• arrow is descending from above with at least 2.0f y velocity
• the arrow's tip y position from the previous tick is above the bucket's y position
• the bucket isn't underwater

If the conditions are met, it makes a splash, extinguishes fire arrow and ignores the collision with the bucket (no damage from enemy arrow).

Tested in offline Sandbox, should work the same in online.

ArrowBucketSplash.mp4

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Fixes #2445

I removed the doesCollideWithBlob() call from onCollision() because otherwise the code in doesCollideWithBlob() runs twice. I have not found issues after removing it.

Change Requests

Let me know what you think and if there are requests for changes.
For example, I can make it so enemy arrows will still hit the bucket to deal damage.

Steps to Test or Reproduce

Be archer and shoot at a filled bucket (from your team or enemy team).
Notice it will splash if arrow collides from above.