style(miscellaneous): move Placeholders.h from Templates to Miscellaneous

Redcraft.Utility/Source/Public/CoreTypes.h

@@ -2,3 +2,4 @@
 
 #include "Miscellaneous/Platform.h"
 #include "Miscellaneous/CoreDefines.h"
+#include "Miscellaneous/Placeholders.h"

Redcraft.Utility/Source/Public/Templates/Optional.h

@@ -2,7 +2,6 @@
 
 #include "CoreTypes.h"
 #include "Templates/Compare.h"
-#include "Templates/Placeholders.h"
 #include "Concepts/Comparable.h"
 #include "TypeTraits/TypeTraits.h"
 #include "Miscellaneous/AssertionMacros.h"

Redcraft.Utility/Source/Public/Templates/Templates.h

@@ -2,7 +2,6 @@
 
 #include "CoreTypes.h"
 #include "Templates/Utility.h"
-#include "Templates/Placeholders.h"
 #include "Templates/Container.h"
 #include "Templates/Noncopyable.h"
 #include "Templates/Invoke.h"

Redcraft.Utility/Source/Public/Templates/Variant.h

@@ -3,7 +3,6 @@
 #include "CoreTypes.h"
 #include "Templates/Invoke.h"
 #include "Templates/Utility.h"
-#include "Templates/Placeholders.h"
 #include "TypeTraits/TypeTraits.h"
 
 NAMESPACE_REDCRAFT_BEGIN