Com: Make the comment length explicit

sendComment cannot send more than 62 bytes, as limited by the HID report.
Sending more is prevented by vsnprintf, but change the function signature
to make it explicit that the array passed to it should be at most 62 bytes.

src/Com.cpp

@@ -28,7 +28,7 @@ namespace Com {
 		flushBuffer();
 	}
 
-	void sendComment(const char *message, ...) {
+	void sendComment(const char message[62], ...) {
 		va_list args;
 		va_start(args, message);
 		buffer[0] = '#';