Initial commit: Forge 1.20.1 Ellie companion mod

- EllieEntity with GeckoLib animations, sleep AI, pathfinding with crouching
- Dialog system with conditions and effects
- Relationship system with milestones
- OpenDoor and bed occupation pathfinding
- 15 animations: idle1/2/3, sleep, walkingsimple, shiftwalking/shiftidle, etc.

src/main/java/me/sashegdev/fabled_hearts/registry/ModItems.java

@@ -0,0 +1,34 @@
+package me.sashegdev.fabled_hearts.registry;
+
+import me.sashegdev.fabled_hearts.Main;
+import me.sashegdev.fabled_hearts.menu.EllieSpawnItem;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.network.chat.Component;
+import net.minecraft.world.item.CreativeModeTab;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.registries.DeferredRegister;
+import net.minecraftforge.registries.ForgeRegistries;
+import net.minecraftforge.registries.RegistryObject;
+
+public class ModItems {
+    public static final DeferredRegister<Item> ITEMS =
+            DeferredRegister.create(ForgeRegistries.ITEMS, Main.MODID);
+    public static final DeferredRegister<CreativeModeTab> TABS =
+            DeferredRegister.create(Registries.CREATIVE_MODE_TAB, Main.MODID);
+
+    public static final RegistryObject<Item> ELLIE_SPAWN = ITEMS.register("ellie_spawn", EllieSpawnItem::new);
+
+    public static final RegistryObject<CreativeModeTab> FABLED_TAB = TABS.register("fabled_hearts",
+            () -> CreativeModeTab.builder()
+                    .icon(() -> new ItemStack(ELLIE_SPAWN.get()))
+                    .title(Component.literal("Fabled Hearts"))
+                    .displayItems((params, output) -> output.accept(ELLIE_SPAWN.get()))
+                    .build());
+
+    public static void register(IEventBus bus) {
+        ITEMS.register(bus);
+        TABS.register(bus);
+    }
+}