Code style: move or add licensing information on top of every file

lib/CThreadHelper.h

@@ -1,8 +1,3 @@
-#pragma once
-
-
-
-
 /*
  * CThreadHelper.h, part of VCMI engine
  *
@@ -12,6 +7,8 @@
  * Full text of license available in license.txt file, in main folder
  *
  */
+#pragma once
+
 
 typedef std::function<void()> Task;