[1.18.x] Munchdew eating order weighted by distance from logs

[TheRealWormbo]

This change makes the Munchdew randomly select leaves to eat from among those that are furthest away from logs (as specified via their distance property), rather than strictly iterating over X/Y/Z coordinates. The selection weighting contains an added amount of randomness to deviate a bit from strict Manhattan distance. The requirement for leaves to have air exposure before being selected remains untouched.

[williewillus]

Can you add a video or something comparing the behaviours?

[TheRealWormbo]

I couldn't get Github to recognize my video upload attempts, so here are a couple of YouTube links instead:

• New behavior for this PR – eating from the outside inwards
• Old behavior – visually not very appealing IMHO, also starts leaf decay at the end, when leaves are no longer connected to any logs
• For comparison: Munchdew in 1.12 – likely to disconnect leaves, causing saplings to drop eventually (That's basically what commit ba3ea10 restores, in case you prefer that behavior instead)

[williewillus]

Sounds good. I'm going to apply this to 1.19 only though.