Clean-up include dependencies

Files in irr namespace
Also some spelling fixes

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6526 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CLogger.cpp

@@ -3,6 +3,8 @@
 // For conditions of distribution and use, see copyright notice in irrlicht.h
 
 #include "CLogger.h"
+#include "os.h"
+#include "irrString.h"
 
 namespace irr
 {