LegacyReporterAdapter unbundles INFO messages from assertion to mimic legacy behaviour

- Moved LegacyReporterAdapter out into its own file(s)

include/internal/catch_impl.hpp

@@ -29,6 +29,7 @@
 #include "catch_version.hpp"
 #include "catch_line_wrap.hpp"
 #include "catch_message.hpp"
+#include "catch_legacy_reporter_adapter.hpp"
 
 #include "../reporters/catch_reporter_basic.hpp"
 #include "../reporters/catch_reporter_xml.hpp"
@@ -51,7 +52,6 @@ namespace Catch {
     IReporterFactory::~IReporterFactory() {}
     IReporterRegistry::~IReporterRegistry() {}
     IStreamingReporter::~IStreamingReporter() {}
-    LegacyReporterAdapter::~LegacyReporterAdapter() {}
     AssertionStats::~AssertionStats() {}
     SectionStats::~SectionStats() {}
     TestCaseStats::~TestCaseStats() {}