Make sure all headers in include can be compiled independently

Also adding some to VS2010 project file (for better project search)
Some empty line removal.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6228 dfc29bdd-3216-0410-991c-e03cc46cb475

include/SLight.h

@@ -6,6 +6,7 @@
 #define __S_LIGHT_H_INCLUDED__
 
 #include "SColor.h"
+#include "vector3d.h"
 
 namespace irr
 {
@@ -98,4 +99,3 @@ struct SLight
 } // end namespace irr
 
 #endif
-