Split error macro into two versions (format vs non-formating) to allow format checking at compile-time

src/Nazara/Utility/Node.cpp

@@ -113,7 +113,7 @@ namespace Nz
 		{
 			if (parentNode == this)
 			{
-				NazaraError("A node cannot be it's own parent");
+				NazaraError("a node cannot be it's own parent");
 				return;
 			}