Just the functional assimp lib rather than the entire assimp repository unnecessarily.

Engine/lib/assimp/code/StringUtils.h

@@ -2,7 +2,8 @@
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
-Copyright (c) 2006-2016, assimp team
+Copyright (c) 2006-2017, assimp team
+
 All rights reserved.
 
 Redistribution and use of this software in source and binary forms,
@@ -40,11 +41,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifndef INCLUDED_AI_STRINGUTILS_H
 #define INCLUDED_AI_STRINGUTILS_H
 
-#include <cstdarg>
-#include <string.h>
-#include <stdio.h>
 #include <sstream>
-#include <string>
+#include <stdarg.h>
+#include <cstdlib>
 
 ///	@fn		ai_snprintf
 ///	@brief	The portable version of the function snprintf ( C99 standard ), which works on visual studio compilers 2013 and earlier.
@@ -103,7 +102,7 @@ float ai_strtof( const char *begin, const char *end ) {
         std::string token( begin, len );
         val = static_cast< float >( ::atof( token.c_str() ) );
     }
-    
+
     return val;
 }