Split the NonCopyable helper out of catch_common.hpp

src/catch2/internal/catch_context.cpp

@@ -6,12 +6,12 @@
  *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
 #include <catch2/internal/catch_context.hpp>
-#include <catch2/internal/catch_common.hpp>
+#include <catch2/internal/catch_noncopyable.hpp>
 #include <catch2/internal/catch_random_number_generator.hpp>
 
 namespace Catch {
 
-    class Context : public IMutableContext, NonCopyable {
+    class Context : public IMutableContext, private Detail::NonCopyable {
 
     public: // IContext
         IResultCapture* getResultCapture() override {