Get Cosmopolitan into releasable state

A new rollup tool now exists for flattening out the headers in a way
that works better for our purposes than cpp. A lot of the API clutter
has been removed. APIs that aren't a sure thing in terms of general
recommendation are now marked internal.

There's now a smoke test for the amalgamation archive and gigantic
header file. So we can now guarantee you can use this project on the
easiest difficulty setting without the gigantic repository.

A website is being created, which is currently a work in progress:
https://justine.storage.googleapis.com/cosmopolitan/index.html

libc/alg/shuffle.h

@@ -3,7 +3,6 @@
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 #include "libc/bits/xchg.h"
 
-#if 0
 /**
  * Fisher-Yates shuffle.
  *
@@ -12,7 +11,6 @@
  * @param n is the number of items in A
  * @see ARRAYLEN()
  */
-#endif
 #define shuffle(R, A, n)                      \
   do {                                        \
     autotype(A) Array = (A);                  \