Rewrite our Equals implementations so they don't crash when comparing incompatible objects

OpenRA.FileFormats/HSLColor.cs

@@ -95,11 +95,8 @@ namespace OpenRA.FileFormats
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as HSLColor?;
-				return false;
+			return o != null && o == this;
-
-			HSLColor o = (HSLColor)obj;
-			return o == this;
 		}
 	}
 }

OpenRA.FileFormats/Hotkey.cs

@@ -72,10 +72,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as Hotkey?;
-				return false;
+			return o != null && o == this;
-
-			return (Hotkey)obj == this;
 		}
 
 		public override string ToString() { return "{0} {1}".F(Key, Modifiers.ToString("F")); }

OpenRA.FileFormats/Primitives/Pair.cs

@@ -40,10 +40,8 @@ namespace OpenRA.FileFormats
 
 		public override bool Equals(object obj)
 		{
-			if (!(obj is Pair<T, U>))
+			var o = obj as Pair<T, U>?;
-				return false;
+			return o != null && o == this;
-
-			return (Pair<T, U>)obj == this;
 		}
 
 		public override int GetHashCode()

OpenRA.FileFormats/Primitives/float2.cs

@@ -73,11 +73,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as float2?;
-				return false;
+			return o != null && o == this;
-
-			float2 o = (float2)obj;
-			return o == this;
 		}
 
 		public static readonly float2 Zero = new float2(0, 0);

OpenRA.FileFormats/Primitives/int2.cs

@@ -43,11 +43,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as int2?;
-				return false;
+			return o != null && o == this;
-
-			int2 o = (int2)obj;
-			return o == this;
 		}
 
 		public static readonly int2 Zero = new int2(0, 0);

OpenRA.FileFormats/WAngle.cs

@@ -40,11 +40,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as WAngle?;
-				return false;
+			return o != null && o == this;
-
-			WAngle o = (WAngle)obj;
-			return o == this;
 		}
 
 		public int Sin() { return new WAngle(Angle - 256).Cos(); }

OpenRA.FileFormats/WPos.cs

@@ -56,11 +56,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as WPos?;
-				return false;
+			return o != null && o == this;
-
-			WPos o = (WPos)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0},{1},{2}".F(X, Y, Z); }

OpenRA.FileFormats/WRange.cs

@@ -80,11 +80,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as WRange?;
-				return false;
+			return o != null && o == this;
-
-			WRange o = (WRange)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0}".F(Range); }

OpenRA.FileFormats/WRot.cs

@@ -97,11 +97,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as WRot?;
-				return false;
+			return o != null && o == this;
-
-			WRot o = (WRot)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0},{1},{2}".F(Roll, Pitch, Yaw); }

OpenRA.FileFormats/WVec.cs

@@ -83,11 +83,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as WVec?;
-				return false;
+			return o != null && o == this;
-
-			WVec o = (WVec)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0},{1},{2}".F(X, Y, Z); }

OpenRA.Game/CPos.cs

@@ -54,11 +54,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as CPos?;
-				return false;
+			return o != null && o == this;
-
-			CPos o = (CPos)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0},{1}".F(X, Y); }

OpenRA.Game/CVec.cs

@@ -65,11 +65,8 @@ namespace OpenRA
 
 		public override bool Equals(object obj)
 		{
-			if (obj == null)
+			var o = obj as CVec?;
-				return false;
+			return o != null && o == this;
-
-			CVec o = (CVec)obj;
-			return o == this;
 		}
 
 		public override string ToString() { return "{0},{1}".F(X, Y); }