Texture.remove is a new method that allows you to remove a Frame from a Texture based on its name. Fix phaserjs#4460

Author: photonstorm

src/textures/Texture.js

@@ -177,6 +177,35 @@ var Texture = new Class({
         return frame;
     },
 
+    /**
+     * Removes the given Frame from this Texture. The Frame is destroyed immediately.
+     * 
+     * Any Game Objects using this Frame should stop using it _before_ you remove it,
+     * as it does not happen automatically.
+     *
+     * @method Phaser.Textures.Texture#remove
+     * @since 3.19.0
+     *
+     * @param {string} name - The key of the Frame to remove.
+     *
+     * @return {boolean} True if a Frame with the matching key was removed from this Texture.
+     */
+    remove: function (name)
+    {
+        if (this.has(name))
+        {
+            var frame = this.get(name);
+
+            frame.destroy();
+
+            delete this.frames[name];
+
+            return true;
+        }
+
+        return false;
+    },
+
     /**
      * Checks to see if a Frame matching the given key exists within this Texture.
      *