change IsAnyKeyDown to IsAnyButtonDown and add Float2.Normalized

Source/Engine/Core/Math/Float2.cs

@@ -267,6 +267,19 @@ namespace FlaxEngine
         /// <remarks>This method may be preferred to <see cref="Float2.Length" /> when only a relative length is needed and speed is of the essence.</remarks>
         public float LengthSquared => X * X + Y * Y;
 
+        /// <summary>
+        /// Gets the normalized vector. Returned vector has length equal 1.
+        /// </summary>
+        public Float2 Normalized
+        {
+            get
+            {
+                Float2 result = this;
+                result.Normalize();
+                return result;
+            }
+        }
+
         /// <summary>
         /// Converts the vector into a unit vector.
         /// </summary>