#1 Fixes being able to use abilities of items even when they are two-handed and you are carrying two in each hand.

If you wanted them to work this way, feel free to add to your config:
```yml
# Abilities can be used even when
# the player is encumbered by the
# items that give them
abilities-bypass-encumbering: true
```

Also added `RefreshInventoryEvent` that allows API check of which items are getting equipped, and thus allows to modify them somewhat.

src/main/java/net/Indyuce/mmoitems/api/player/PlayerData.java

@@ -216,6 +216,9 @@ public class PlayerData {
 			inventory.getEquipped().add(new EquippedPlayerItem(item));
 		}
 
+		RefreshInventoryEvent riev = new RefreshInventoryEvent(inventory.getEquipped(), getPlayer(), this);
+		Bukkit.getPluginManager().callEvent(riev);
+
 		for (EquippedPlayerItem equipped : inventory.getEquipped()) {
 			VolatileMMOItem item = equipped.getItem();
 
@@ -244,7 +247,7 @@ public class PlayerData {
 			/*
 			 * Apply abilities
 			 */
-			if (item.hasData(ItemStats.ABILITIES))
+			if (item.hasData(ItemStats.ABILITIES) && (MMOItems.plugin.getConfig().getBoolean("abilities-bypass-encumbering", false) || !fullHands))
 				if (equipped.getSlot() != EquipmentSlot.OFF_HAND || !MMOItems.plugin.getConfig().getBoolean("disable-abilities-in-offhand"))
 					itemAbilities.addAll(((AbilityListData) item.getData(ItemStats.ABILITIES)).getAbilities());
 

src/main/java/net/Indyuce/mmoitems/api/player/RefreshInventoryEvent.java

@@ -0,0 +1,38 @@
+package net.Indyuce.mmoitems.api.player;
+
+import net.Indyuce.mmoitems.api.player.inventory.EquippedPlayerItem;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public class RefreshInventoryEvent extends Event {
+
+    @NotNull final List<EquippedPlayerItem> itemsToEquip;
+    @NotNull public List<EquippedPlayerItem> getItemsToEquip() { return itemsToEquip; }
+
+    @NotNull
+    public Player getPlayer() {
+        return player;
+    }
+
+    @NotNull
+    public PlayerData getPlayerData() {
+        return playerData;
+    }
+
+    @NotNull final Player player;
+    @NotNull final PlayerData playerData;
+
+    public RefreshInventoryEvent(@NotNull List<EquippedPlayerItem> itemsToEquip, @NotNull Player player, @NotNull PlayerData playerData) {
+        this.itemsToEquip = itemsToEquip;
+        this.player = player;
+        this.playerData = playerData;
+    }
+
+    @NotNull static final HandlerList handlers = new HandlerList();
+    @NotNull public HandlerList getHandlers() { return handlers; }
+    @NotNull public static HandlerList getHandlerList() { return handlers; }
+}

src/main/java/net/Indyuce/mmoitems/api/player/inventory/EquippedPlayerItem.java

@@ -12,7 +12,6 @@ public class EquippedPlayerItem {
 	 * An item equipped by a player in a specific slot
 	 * 
 	 * @param item The item equipped
-	 * @param slot The corresponding MMOItems slot type, must not be null!
 	 */
 	public EquippedPlayerItem(EquippedItem item) {
 		this.item = new VolatileMMOItem(item.getItem());