[1.12.2] Hopefully fix remaining issues

[IcarussOne]

Fixes:

• Fixed missing model error with mushrooms.
• Fixed scarecrows not being commandable (issue #158, Hexxit II issue #220).
• Fixed raven position on all scarecrow variants.
• Further polished flying ai (hopefully fixing issues).

Tweaks:

• Dyeing scarecrows is now restricted to the owner.
• Scarecrows now sit completely still on daytime.
• Ghost rays now have more reverb on their sounds.
• Increased bone meal received from chitin and weta jaws. Poison stingers can now be converted into bone meal.
• Vespas, salamanders, lil' sludges, enigmoths, cactyrants, and undertakers now drop more generously.
• Added brick and potion of healing rare drops to undertaker (replacing the carrot and potato).
• Added crown drop to forsaken.
• Added prickly pear drop to cactoids and cactyrants.
• Added weta jaw drop to avatons.
• Golden heart now requires a nether star and will now accept anything that uses the 'heartUndying' oredictionary.

Updated Textures:

• Enigmoth Larva (Item)
• Molten Hammer
• Ptera Wing (Desert)