Moved leak detector to its own file

include/internal/catch_leak_detector.cpp

@@ -0,0 +1,33 @@
+/*
+ *  Created by Martin on 12/07/2017.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+ #include "catch_leak_detector.h"
+
+
+namespace Catch {
+
+#ifdef CATCH_CONFIG_WINDOWS_CRTDBG
+#include <crtdbg.h>
+
+	LeakDetector::LeakDetector() {
+		int flag = _CrtSetDbgFlag(_CRTDBG_REPORT_FLAG);
+		flag |= _CRTDBG_LEAK_CHECK_DF;
+		flag |= _CRTDBG_ALLOC_MEM_DF;
+		_CrtSetDbgFlag(flag);
+		_CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
+		_CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDERR);
+		// Change this to leaking allocation's number to break there
+		_CrtSetBreakAlloc(-1);
+	}
+
+#else
+
+    LeakDetector::LeakDetector(){}
+
+#endif
+
+}