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/Audio/OpenALDevice.cpp

@@ -132,7 +132,7 @@ namespace Nz
 		m_library.alGetListenerfv(AL_ORIENTATION, orientation);
 
 		if (up)
-			up->Set(orientation[3], orientation[4], orientation[5]);
+			(*up) = Vector3f(orientation[3], orientation[4], orientation[5]);
 
 		return Vector3f(orientation[0], orientation[1], orientation[2]);
 	}