add Fix64-int arithmetic

src/Math/Fixed/Fix64.cs

@@ -531,6 +531,16 @@ namespace MoonWorks.Math.Fixed
 			return new Fix64(sum);
 		}
 
+		public static Fix64 operator +(Fix64 x, int y)
+		{
+			return x + new Fix64(y);
+		}
+
+		public static Fix64 operator +(int x, Fix64 y)
+		{
+			return new Fix64(x) + y;
+		}
+
 		public static Fix64 operator -(Fix64 x, Fix64 y)
 		{
 			var xl = x.RawValue;
@@ -544,6 +554,16 @@ namespace MoonWorks.Math.Fixed
 			return new Fix64(diff);
 		}
 
+		public static Fix64 operator -(Fix64 x, int y)
+		{
+			return x - new Fix64(y);
+		}
+
+		public static Fix64 operator -(int x, Fix64 y)
+		{
+			return new Fix64(x) - y;
+		}
+
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
 		private static Fix64 FastSub(Fix64 x, Fix64 y)
 		{
@@ -668,6 +688,16 @@ namespace MoonWorks.Math.Fixed
 			return result;
 		}
 
+		public static Fix64 operator *(Fix64 x, int y)
+		{
+			return x * new Fix64(y);
+		}
+
+		public static Fix64 operator *(int x, Fix64 y)
+		{
+			return new Fix64(x) * y;
+		}
+
 		public static Fix64 operator /(Fix64 x, Fix64 y)
 		{
 			var xl = x.RawValue;
@@ -726,6 +756,16 @@ namespace MoonWorks.Math.Fixed
 			return new Fix64(result);
 		}
 
+		public static Fix64 operator /(Fix64 x, int y)
+		{
+			return x / new Fix64(y);
+		}
+
+		public static Fix64 operator /(int x, Fix64 y)
+		{
+			return new Fix64(x) / y;
+		}
+
 		public static Fix64 operator %(Fix64 x, Fix64 y)
 		{
 			return new Fix64(
@@ -734,6 +774,16 @@ namespace MoonWorks.Math.Fixed
 				x.RawValue % y.RawValue);
 		}
 
+		public static Fix64 operator %(Fix64 x, int y)
+		{
+			return x % new Fix64(y);
+		}
+
+		public static Fix64 operator %(int x, Fix64 y)
+		{
+			return new Fix64(x) % y;
+		}
+
 		public static Fix64 operator -(Fix64 x)
 		{
 			return x.RawValue == MIN_VALUE ? MaxValue : new Fix64(-x.RawValue);