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/nt/enum/progress.h

@@ -0,0 +1,9 @@
+#ifndef COSMOPOLITAN_LIBC_NT_ENUM_PROGRESS_H_
+#define COSMOPOLITAN_LIBC_NT_ENUM_PROGRESS_H_
+
+#define kNtProgressContinue 0
+#define kNtProgressCancel   1
+#define kNtProgressStop     2
+#define kNtProgressQuiet    3
+
+#endif /* COSMOPOLITAN_LIBC_NT_ENUM_PROGRESS_H_ */