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=

tests/UnitTests/Engine/Math/AngleTest.cpp

@@ -196,7 +196,7 @@ SCENARIO("Angle", "[MATH][ANGLE]")
 			{
 				Nz::RadianAnglef expectedResult(Nz::Pi<float>);
 
-				CHECK(angle == expectedResult);
+				CHECK(angle.ApproxEqual(expectedResult));
 			}
 		}
 	}
@@ -213,7 +213,7 @@ SCENARIO("Angle", "[MATH][ANGLE]")
 			{
 				Nz::RadianAnglef expectedResult(0.f);
 
-				CHECK(angle == expectedResult);
+				CHECK(angle.ApproxEqual(expectedResult));
 			}
 		}
 	}
@@ -230,7 +230,7 @@ SCENARIO("Angle", "[MATH][ANGLE]")
 			{
 				Nz::TurnAnglef expectedResult(0.5f);
 
-				CHECK(angle == expectedResult);
+				CHECK(angle.ApproxEqual(expectedResult));
 			}
 		}
 	}