fix: unescape escapes, escaped by Entry widget
fix: unescape escapes, escaped by Entry widget

The tkinter.Entry widget escapes entered backslashes. There is a codec
'unicode_escape' to remove escapes from escapes while decoding a bytes
array. So we encode the entered String as 'utf-8', decode it with
'unicode_escape' and because we need the data as a bytes array, we
encode it again, using 'latin1' codec because it encodes 8 bit words
1-on-1.

niun/motty