Improve math module (#396)

* Improve math module

- Mark almost everything constexpr
- Equality (a == b) is now exact, down to the bit level. If you want approximate equality use the new ApproxEqual method/static method
- Rename Nz::Extend to Nz::Extent
- Removed Make[] and Set[] methods in favor of their static counterpart and operator=

src/Nazara/Core/StdLogger.cpp

@@ -82,7 +82,7 @@ namespace Nz
 	{
 		NAZARA_USE_ANONYMOUS_NAMESPACE
 
-		fprintf(stderr, "%s: ", s_errorTypes[type]);
+		fprintf(stderr, "%s: ", s_errorTypes[type].data());
 		fwrite(error.data(), sizeof(char), error.size(), stdout);
 
 		if (line != 0 && file && function)