Allow servers to be run from directories other than build. Read/write files relative to binary instead of cwd (#834)

Allows the server to be run from a non-build directory.  Also only read or write files relative to the build directory, regardless of where the server is run from

dCommon/BinaryPathFinder.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#ifndef __BINARYPATHFINDER__H__
+#define __BINARYPATHFINDER__H__
+
+#include <filesystem>
+
+class BinaryPathFinder {
+private:
+	static std::filesystem::path binaryDir;
+public:
+	static std::filesystem::path GetBinaryDir();
+};
+
+#endif  //!__BINARYPATHFINDER__H__