Updated assimp to latest

Engine/lib/assimp/code/XFileExporter.cpp

@@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
-Copyright (c) 2006-2017, assimp team
+Copyright (c) 2006-2019, assimp team
+
 
 All rights reserved.
 
@@ -46,15 +47,15 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "XFileExporter.h"
 #include "ConvertToLHProcess.h"
-#include "Bitmap.h"
-#include "BaseImporter.h"
-#include "fast_atof.h"
+#include <assimp/Bitmap.h>
+#include <assimp/BaseImporter.h>
+#include <assimp/fast_atof.h>
 #include <assimp/SceneCombiner.h>
 #include <assimp/DefaultIOSystem.h>
 #include <ctime>
 #include <set>
 #include <memory>
-#include "Exceptional.h"
+#include <assimp/Exceptional.h>
 #include <assimp/IOSystem.hpp>
 #include <assimp/scene.h>
 #include <assimp/light.h>
@@ -131,7 +132,7 @@ void XFileExporter::WriteFile()
 {
     // note, that all realnumber values must be comma separated in x files
     mOutput.setf(std::ios::fixed);
-    mOutput.precision(16); // precission for double
+    mOutput.precision(16); // precision for double
 
     // entry of writing the file
     WriteHeader();