200d: copy console printf to uart, add CONFIG flag

CONFIG_COPY_CONSOLE_TO_UART makes printf() in console.c
also output to uart.  Designed for debugging, not tested
extensively.  Spamming uart too hard to lock it up.

platform/200D.101/features.h

@@ -18,6 +18,9 @@
 // dumping all the images that old cams support
 #define FEATURE_SCREENSHOT
 
+// duplicate all printf (console) output to uart
+#define CONFIG_COPY_CONSOLE_TO_UART
+
 // cam doesn't expose call("TurnOnDisplay"),
 // (or TurnOffDisplay), so we must find stubs
 // and call directly

src/console.c

@@ -330,6 +330,10 @@ int printf(const char* fmt, ...)
     int len = vsnprintf( buf, buf_size-1, fmt, ap );
     va_end( ap );
     console_puts(buf);
+#ifdef CONFIG_COPY_CONSOLE_TO_UART
+    extern int uart_printf(const char *fmt, ...);
+    uart_printf(buf);
+#endif
     return len;
 }