Streamline includes in external interfaces

include/internal/catch_registry_hub.cpp

@@ -8,6 +8,7 @@
 
 #include "catch_interfaces_registry_hub.h"
 
+#include "catch_context.h"
 #include "catch_test_case_registry_impl.hpp"
 #include "catch_reporter_registry.hpp"
 #include "catch_exception_translator_registry.h"