Improve Python and Linenoise

This change reinvents all the GNU Readline features I discovered that I
couldn't live without, e.g. UTF-8, CTRL-R search and CTRL-Y yanking. It
now feels just as good in terms of user interface from the subconscious
workflow perspective. It's real nice to finally have an embeddable line
reader that's actually good with a 30 kb footprint and a bsd-2 license.

This change adds a directory to the examples folder, explaining how the
new Python compiler may be used.  Some of the bugs with Python binaries
have been addressed but overall it's still a work in progress.

libc/runtime/ftracer.c

@@ -104,6 +104,7 @@ privileged noasan void ftracer(void) {
         p = mempcpy(p, symbol, symbolsize);
         *p++ = ' ';
         p += uint64toarray_radix10((stamp - laststamp) / 3.3, p);
+        *p++ = '\r';
         *p++ = '\n';
         write(2, g_buf, p - g_buf);
       }