Added .item:serializer module to automatically load and save item o…

…bjects.

Added parsers:
- [EnchantmentParser](item/serializer/src/main/java/it/angrybear/serializers/EnchantmentParser.java);
- [ItemParser](item/serializer/src/main/java/it/angrybear/serializers/ItemParser.java);
- [ShapeParser](item/serializer/src/main/java/it/angrybear/serializers/ShapeParser.java);
- [ShapedRecipeParser](item/serializer/src/main/java/it/angrybear/serializers/ShapedRecipeParser.java);
- [ShapelessRecipeParser](item/serializer/src/main/java/it/angrybear/serializers/ShapelessRecipeParser.java);
- [FurnaceRecipeParser](item/serializer/src/main/java/it/angrybear/serializers/FurnaceRecipeParser.java).
Added [YAGLParser](item/serializer/src/main/java/it/angrybear/serializers/YAGLParser.java) to automatically load parsers.
Moved everything to package `it.angrybear.yagl`.
Reworked `Item#copy()` method: it will try to get a default empty constructor from the current class. If it fails, it defaults to `ItemImpl`.
Fixed `Item#copy(Class)` with automatic resolution of interfaces: passing `Item` or `BukkitItem` will convert them into `ItemImpl` and `BukkitItemImpl`.
Fixed `Item#copy(Class)` not checking if current item has field of receiving class.
Fixed various bugs in **ShapedRecipe**.
Fixed recipes not copying items in their most default state (Item).
Fixed invalid casts to `BukkitItem` in `ItemUtils`.
Fixed `ItemUtils`: now it will apply model data only for values higher than 0.
Fixed visibility issues in `PersistentListener`: every event method is now protected.
Fixed PersistentListener not checking for main hand upon interacting.
Updated FulmiCollection to version 1.4.1.

item/bukkit/src/main/java/it/angrybear/yagl/listeners/PersistentListener.java

@@ -16,6 +16,7 @@
 import org.bukkit.event.player.PlayerInteractEvent;
 import org.bukkit.event.player.PlayerItemConsumeEvent;
 import org.bukkit.event.player.PlayerItemDamageEvent;
+import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.PlayerInventory;
 import org.jetbrains.annotations.NotNull;
@@ -64,6 +65,7 @@ protected void on(PlayerDeathEvent event) {
 
     @EventHandler
     protected void on(PlayerInteractEvent event) {
+        if (event.getHand() != EquipmentSlot.HAND) return;
         Player player = event.getPlayer();
         interactPersistentItem(event.getItem(), player, event.getAction(), cancelled(event));
     }