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.
    */

bin/tests/rwlock_test.c

@@ -19,14 +19,11 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <unistd.h>
 
-#include <isc/assertions.h>
-#include <isc/error.h>
 #include <isc/thread.h>
-#include <isc/result.h>
 #include <isc/rwlock.h>
+#include <isc/string.h>
 #include <isc/util.h>
 
 isc_rwlock_t lock;