todo

- choice of letter to remove (I/J or Q, or maybe custom letter)

- more matrix transform patterns (eg. S-shape row1>,row2<,row3>,row4<,row5>)

- autodetect ansi_terminal, and allow force enable/disable in options

- ansi_terminal: use proper escape sequences in Windows

- echoless input for the key (can be disabled in options)

- Normalize() should handle letters with accent

- interactive mode (is the current behavior with incomplete arguments): should be disabled
  by default and could be enabled with an option. If disabled (batch mode) application should
  fail if given incomplete arguments

- check if input for -r and -d have odd number of characters

- switch to getopts in main()