#259 Feeback to user

[nylonnet]

When I hit the magic keys to start an OCR, exactly nothing happens.
There is no feeback to indicate that the scan is active.
Please provide the option for a sound, or maybe a flashing pixel to tell me that the program is active.

Also, as someone else suggested, it is more intuitive to click and drag to define the OCR recording area, as happens in some screenshot apps.

BTW, love the app. It beats the ABBYY screenshot reader app I actually paid for.