refactor: 💥 Scalar concept renamed to ScalableNumber

Resolves #114

example/glide_computer.cpp

@@ -87,7 +87,7 @@ public:
   }
 
   template<typename V>
-    requires (Scalar<V> || Dimensionless<V>)
+    requires (ScalableNumber<V> || Dimensionless<V>)
   [[nodiscard]] friend constexpr auto operator*(const vector& lhs, const V& value)
     requires requires { lhs.magnitude() * value; }
   {
@@ -95,7 +95,7 @@ public:
   }
 
   template<typename V>
-    requires (Scalar<V> || Dimensionless<V>)
+    requires (ScalableNumber<V> || Dimensionless<V>)
   [[nodiscard]] friend constexpr auto operator*(const V& value, const vector& rhs)
     requires requires { value * rhs.magnitude(); }
   {

example/linear_algebra.cpp

@@ -200,10 +200,10 @@ void matrix_of_quantity_tests()
   matrix_of_quantity_divide_by_scalar();
 }
 
-template<units::Unit U = si::metre, units::Scalar Rep = double>
+template<units::Unit U = si::metre, units::ScalableNumber Rep = double>
 using length_v = si::length<U, vector<Rep>>;
 
-template<units::Unit U = si::newton, units::Scalar Rep = double>
+template<units::Unit U = si::newton, units::ScalableNumber Rep = double>
 using force_v = si::force<U, vector<Rep>>;
 
 void quantity_of_vector_add()
@@ -273,7 +273,7 @@ void quantity_of_vector_tests()
   quantity_of_vector_divide_by_scalar();
 }
 
-template<units::Unit U = si::metre, units::Scalar Rep = double>
+template<units::Unit U = si::metre, units::ScalableNumber Rep = double>
 using length_m = si::length<U, matrix<Rep>>;
 
 void quantity_of_matrix_add()

example/measurement.cpp

@@ -114,7 +114,7 @@ private:
   value_type uncertainty_{};
 };
 
-static_assert(units::Scalar<measurement<double>>);
+static_assert(units::ScalableNumber<measurement<double>>);
 
 }  // namespace