Tree Hollows Revived

First release of Tree Hollows Revived, for Minecraft 1.21.1 and 26.3 on Fabric, Quilt and NeoForge. It carries on Tree Hollows by Reoseah.

• About one tree in twenty has a hollow in its trunk, in the trees of every vanilla wood
• Hollows hold a little loot: sticks, feathers, eggs, seeds, mushrooms and gold nuggets, and with luck an enchanted book, an emerald or a music disc
• Silk Touch takes a hollow home as a small 3×3 container; otherwise it breaks into sticks
• Trees grown from saplings sometimes get an empty hollow
• Settings for how many generated and grown trees get a hollow

Requires YetAnotherConfigLib, and Fabric API on Fabric and Quilt.