Dependency on gsl-lite removed as it causes issues with compiler-explorer

src/include/units/bits/hacks.h

@@ -23,6 +23,10 @@
 #pragma once
 
 #include <experimental/ranges/concepts>
+#include <exception>
+
+
+#define Expects(cond) if(!(cond)) ::std::terminate();
 
 namespace std {