Megacommit of dozens of files.

Cleanup of redundant/useless header file inclusion.

ISC style lint, primarily for function declarations and standalone
comments -- ie, those that appear on a line without any code, which
should be written as follows:
   /*
    * This is a comment.
    */

lib/isc/random.c

@@ -18,12 +18,11 @@
 #include <config.h>
 
 #include <stdlib.h>
-#include <string.h>
 
-#include <isc/assertions.h>
 #include <isc/mutex.h>
 #include <isc/once.h>
 #include <isc/random.h>
+#include <isc/string.h>
 #include <isc/util.h>
 
 static isc_once_t once = ISC_ONCE_INIT;