MSVC Support fixes.

include/J3ML/J3ML.h

@@ -7,7 +7,6 @@
 //
 #include <cstdint>
 #include <cmath>
-#include <stdfloat>
 #include <string>
 #include <cassert>
 
@@ -17,13 +16,11 @@ namespace J3ML::SizedIntegralTypes
     using u16 = uint16_t;
     using u32 = uint32_t;
     using u64 = uint64_t;
-    using u128 = __uint128_t;
 
     using s8 = int8_t;
     using s16 = int16_t;
     using s32 = int32_t;
     using s64 = int64_t;
-    using s128 = __int128_t;
 }
 
 
@@ -39,6 +36,11 @@ namespace J3ML::SizedFloatTypes
 using namespace J3ML::SizedIntegralTypes;
 using namespace J3ML::SizedFloatTypes;
 
+//On windows there is no shorthand for pi???? - Redacted.
+#ifdef _WIN32
+#define M_PI 3.14159265358979323846
+#endif
+
 namespace J3ML::Math
 {