Fix bugs and add security features to redbean

- Fix a regression with the previous change that broke redbean
- Add chroot(), resource limit, seccomp, and other stuff to redbean
- Write lots and lots of documentation
- Iron out more system call issues

libc/calls/chdir-nt.c

@@ -76,5 +76,5 @@ textwindows int sys_chdir_nt(const char *path) {
       }
     }
   }
-  return -1;
+  return __fix_enotdir(-1, path16);
 }