Ignore certain keys

[josephernest]

Congrats @brookhong for this very nice tool! I'd like to ignore certain keys: when A-Z, a-z is pressed (without CTRL, WITHOUT ALT, etc.) I'd like to display nothing.

Where can I do this? Around https://github.com/brookhong/KeyCastOW/blob/master/keylog.cpp#L220 I guess, but where exactly? What line should I add/modify?

Thanks a lot in advance.