Compilation for MSVC2013, thanks @dalkon

OTclient now compiles in "Microsoft Visual Studio 2013 Express for Windows Desktop"
All the needed libraries you can download at https://www.dropbox.com/s/2yfb1c763io8efy/otclient-msvc13-libs.zip
NOTE: You have to change VC++ Directories to the properly directories
NOTE: Latested MSVC 2013 or greated is required

src/framework/stdext/demangle.cpp

@@ -38,7 +38,7 @@ const char* demangle_name(const char* name)
 #ifdef _MSC_VER
     static char buffer[1024];
     UnDecorateSymbolName(name, buffer, sizeof(buffer), UNDNAME_COMPLETE);
-    return &buffer[6];
+    return buffer;
 #else
     size_t len;
     int status;