Implement basic canonical mode for Windows

The `cat` command now works properly, when run by itself on the bash
command prompt. It's working beautifully so far, and is only missing
a few keystrokes for clearing words and lines. Definitely works more
well than the one that ships with WIN32 :-)

libc/intrin/kprintf.greg.c

@@ -800,7 +800,7 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
           // undocumented %r specifier
           // used for good carriage return
           // helps integrate loggers with repls
-          if (!__replstderr || __nocolor) {
+          if (!__ttyconf.replstderr || __nocolor) {
             break;
           } else {
             s = "\r\e[K";