Porting to 1.12.2 progress

[Ugachaga]

1. Registration / Initialization [95% ready]:

• Blocks, Items, Fluids, TESRs, TEISRs, Entities, Keybinds, Layers;
• Status Overlay, Custom Fluid Containers;

2. Models / Rendering / Effects [90% ready]:

• Models, Blocks, Items, Wearable Layer;
• GUI tweaks, Sleeping Bag, Status Overlay;
• Out of scope for alpha: Hose variants, Inflatable Boat, Sounds, Particles;

3. Network / Packets [0%]:

• Total reorganization of packets;

4. Capabilities / Inventories [5%]:

• Migrating from IEEP, IInventory, ISidedInventory, ect. to Capabilities. This one is big, mostly preparation / planning stage;

5. Recipes / Configuration [20%]:

• JSON recipes, Special recipes for Backpacks;
• Config reorganization, implementing sync;

6. Others [?%]:

• Resourses pack format 3;
• Backapck Abilities, Events;
• Worldgen and such low priority things.