Add Alt-click functionality (#4497)

* Fix ItemSlot Bug

* Add Alt-use Key

* Fix TransferAmount window bug

* Alt-click functionality

* Added AltInteract verbs

* Add new verbs

* verb icons

* Changed Comments

* Change Comments

* Fix disposal verbs

* Changed Get...() to Get...OrNull()

* Changed alt-interact combat behaviour

* Update verb icons

* Inventory interact event

* Add Alt+E secondary binding

* Add alt-z keybinding

* Rename AltUse -> AltActivateItemInWorld

Content.Shared/Verbs/VerbBase.cs

@@ -1,4 +1,4 @@
-
+
 namespace Content.Shared.Verbs
 {
     public abstract class VerbBase
@@ -15,5 +15,10 @@ namespace Content.Shared.Verbs
         ///     OR the user can be the entity's container
         /// </summary>
         public virtual bool BlockedByContainers => true;
+
+        /// <summary>
+        ///     If true, this verb can be activated by alt-clicking on the entity.
+        /// </summary>
+        public virtual bool AlternativeInteraction => false;
     }
 }

Content.Shared/Verbs/VerbCategories.cs

@@ -10,7 +10,8 @@ namespace Content.Shared.Verbs
             ("Debug", "/Textures/Interface/VerbIcons/debug.svg.192dpi.png");
 
         public static readonly VerbCategoryData Rotate = ("Rotate", null);
-        public static readonly VerbCategoryData Construction = ("Construction", null);
+        public static readonly VerbCategoryData Construction =
+            ("Construction", "/Textures/Interface/hammer_scaled.svg.192dpi.png");
         public static readonly VerbCategoryData SetTransferAmount =
             ("Set Transfer Amount", "/Textures/Interface/VerbIcons/spill.svg.192dpi.png");
     }

Content.Shared/Verbs/VerbData.cs

@@ -16,6 +16,9 @@ namespace Content.Shared.Verbs
         /// <summary>
         ///     The text that the user sees on the verb button.
         /// </summary>
+        /// <remarks>
+        ///     This string is automatically passed through Loc.GetString().
+        /// </remarks>
         public string Text { get; set; } = string.Empty;
 
         /// <summary>