Inventory Input (#503)

* Create ItemSlotButton

* Refactor inventory buttons

Refactor so that KeyBind handling of inventory and hands are the same.

* Refactor InventoryInterfaceController to call ItemSlotManager with entities

This change allows HandsGUI and InventoryInterfaceController to just call ItemSlotManager.OnButtonPressed with an entity instead of a slot.

* Add CooldownCircle to ItemSlotButton

This allows Hands and Inventory to have cooldown circles on their ItemSlots.

* Refactor HandsGUI to use ItemSlots

This allows functionality and GUI to be the same between Inventory and Hands.

Added clicking empty hand to switch ActiveHand to clicked hand.

* Implement CooldownCircle in ItemSlotManager

Reorganize files

Content.Tests/Client/UserInterface/HandsGuiTest.cs

@@ -1,17 +0,0 @@
-using Content.Client.UserInterface;
-using NUnit.Framework;
-
-namespace Content.Tests.Client.UserInterface
-{
-    [TestFixture]
-    public class HandsGuiTest
-    {
-        [Test]
-        public void TestCalculateCooldownLevel()
-        {
-            Assert.AreEqual(HandsGui.CalculateCooldownLevel(0.5f), 4);
-            Assert.AreEqual(HandsGui.CalculateCooldownLevel(1), 8);
-            Assert.AreEqual(HandsGui.CalculateCooldownLevel(0), 0);
-        }
-    }
-}

Content.Tests/Client/UserInterface/ItemSlotTest.cs

@@ -0,0 +1,17 @@
+using Content.Client.UserInterface;
+using NUnit.Framework;
+
+namespace Content.Tests.Client.UserInterface
+{
+    [TestFixture]
+    public class ItemSlotTest
+    {
+        [Test]
+        public void TestCalculateCooldownLevel()
+        {
+            Assert.AreEqual(ItemSlotManager.CalculateCooldownLevel(0.5f), 4);
+            Assert.AreEqual(ItemSlotManager.CalculateCooldownLevel(1), 8);
+            Assert.AreEqual(ItemSlotManager.CalculateCooldownLevel(0), 0);
+        }
+    }
+}