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

dNavigation/dNavMesh.cpp

@@ -7,6 +7,7 @@
 #include "dPlatforms.h"
 #include "NiPoint3.h"
 #include "BinaryIO.h"
+#include "BinaryPathFinder.h"
 
 #include "dZoneManager.h"
 
@@ -43,7 +44,7 @@ dNavMesh::~dNavMesh() {
 
 void dNavMesh::LoadNavmesh() {
 
-	std::string path = "./navmeshes/" + std::to_string(m_ZoneId) + ".bin";
+	std::string path = (BinaryPathFinder::GetBinaryDir() / "navmeshes/" / (std::to_string(m_ZoneId) + ".bin")).string();
 
 	if (!BinaryIO::DoesFileExist(path)) {
 		return;