Expand ArmorStand API

Adds the following:
- Add proper methods for getting and setting items in both hands. Deprecates old methods
- Enable/Disable slot interactions
- Allow using degrees for ArmorStand rotations (via new Rotations class)

== AT ==
public net.minecraft.world.entity.decoration.ArmorStand isDisabled(Lnet/minecraft/world/entity/EquipmentSlot;)Z

Co-authored-by: SoSeDiK <mrsosedik@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftArmorStand.java

@@ -233,6 +233,149 @@ public class CraftArmorStand extends CraftLivingEntity implements ArmorStand {
         getHandle().canMove = move;
     }
 
+    @Override
+    public ItemStack getItem(org.bukkit.inventory.EquipmentSlot slot) {
+        com.google.common.base.Preconditions.checkArgument(slot != null, "slot");
+        com.google.common.base.Preconditions.checkArgument(slot != EquipmentSlot.BODY, "Cannot get body item");
+        return getHandle().getItemBySlot(org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot)).asBukkitMirror();
+    }
+
+    @Override
+    public void setItem(org.bukkit.inventory.EquipmentSlot slot, ItemStack item) {
+        com.google.common.base.Preconditions.checkArgument(slot != null, "slot");
+        com.google.common.base.Preconditions.checkArgument(slot != EquipmentSlot.BODY, "Cannot set body item");
+        switch (slot) {
+            case HAND:
+                getEquipment().setItemInMainHand(item);
+                return;
+            case OFF_HAND:
+                getEquipment().setItemInOffHand(item);
+                return;
+            case FEET:
+                setBoots(item);
+                return;
+            case LEGS:
+                setLeggings(item);
+                return;
+            case CHEST:
+                setChestplate(item);
+                return;
+            case HEAD:
+                setHelmet(item);
+                return;
+        }
+        throw new UnsupportedOperationException(slot.name());
+    }
+
+    @Override
+    public java.util.Set<org.bukkit.inventory.EquipmentSlot> getDisabledSlots() {
+        java.util.Set<org.bukkit.inventory.EquipmentSlot> disabled = new java.util.HashSet<>();
+        for (org.bukkit.inventory.EquipmentSlot slot : org.bukkit.inventory.EquipmentSlot.values()) {
+            if (this.isSlotDisabled(slot)) {
+                disabled.add(slot);
+            }
+        }
+        return disabled;
+    }
+
+    @Override
+    public void setDisabledSlots(org.bukkit.inventory.EquipmentSlot... slots) {
+        int disabled = 0;
+        for (org.bukkit.inventory.EquipmentSlot slot : slots) {
+            if (slot == org.bukkit.inventory.EquipmentSlot.OFF_HAND) continue;
+            net.minecraft.world.entity.EquipmentSlot nmsSlot = org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot);
+            disabled += (1 << nmsSlot.getFilterBit(0)) + (1 << nmsSlot.getFilterBit(8)) + (1 << nmsSlot.getFilterBit(16));
+        }
+        getHandle().disabledSlots = disabled;
+    }
+
+    @Override
+    public void addDisabledSlots(org.bukkit.inventory.EquipmentSlot... slots) {
+        java.util.Set<org.bukkit.inventory.EquipmentSlot> disabled = getDisabledSlots();
+        java.util.Collections.addAll(disabled, slots);
+        setDisabledSlots(disabled.toArray(new org.bukkit.inventory.EquipmentSlot[0]));
+    }
+
+    @Override
+    public void removeDisabledSlots(org.bukkit.inventory.EquipmentSlot... slots) {
+        java.util.Set<org.bukkit.inventory.EquipmentSlot> disabled = getDisabledSlots();
+        for (final org.bukkit.inventory.EquipmentSlot slot : slots) disabled.remove(slot);
+        setDisabledSlots(disabled.toArray(new org.bukkit.inventory.EquipmentSlot[0]));
+    }
+
+    @Override
+    public boolean isSlotDisabled(org.bukkit.inventory.EquipmentSlot slot) {
+        return getHandle().isDisabled(org.bukkit.craftbukkit.CraftEquipmentSlot.getNMS(slot));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getBodyRotations() {
+        return fromNMSRotations(getHandle().bodyPose);
+    }
+
+    @Override
+    public void setBodyRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setBodyPose(toNMSRotations(rotations));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getLeftArmRotations() {
+        return fromNMSRotations(getHandle().leftArmPose);
+    }
+
+    @Override
+    public void setLeftArmRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setLeftArmPose(toNMSRotations(rotations));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getRightArmRotations() {
+        return fromNMSRotations(getHandle().rightArmPose);
+    }
+
+    @Override
+    public void setRightArmRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setRightArmPose(toNMSRotations(rotations));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getLeftLegRotations() {
+        return fromNMSRotations(getHandle().leftLegPose);
+    }
+
+    @Override
+    public void setLeftLegRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setLeftLegPose(toNMSRotations(rotations));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getRightLegRotations() {
+        return fromNMSRotations(getHandle().rightLegPose);
+    }
+
+    @Override
+    public void setRightLegRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setRightLegPose(toNMSRotations(rotations));
+    }
+
+    @Override
+    public io.papermc.paper.math.Rotations getHeadRotations() {
+        return fromNMSRotations(getHandle().headPose);
+    }
+
+    @Override
+    public void setHeadRotations(io.papermc.paper.math.Rotations rotations) {
+        getHandle().setHeadPose(toNMSRotations(rotations));
+    }
+
+    private static io.papermc.paper.math.Rotations fromNMSRotations(Rotations old) {
+        return io.papermc.paper.math.Rotations.ofDegrees(old.getX(), old.getY(), old.getZ());
+    }
+
+    private static Rotations toNMSRotations(io.papermc.paper.math.Rotations old) {
+        return new Rotations((float) old.x(), (float) old.y(), (float) old.z());
+    }
+
     @Override
     public boolean canTick() {
         return this.getHandle().canTick;