[FreeVision] improve Open File dialog UX
- Sort files and folders in a way orthodox file manager do: folders first, files second - Swap File List and File Name fields (just as it is done in Windows "Open File" dialog) to save key presses on the most frequent operations - After exiting the folder with "..", set cursor to the folder we have exited from - Home and End keys now move cursor to the first and last file in list, not first and last visible file (just as they behave in Windows) - Mark folders by colors, not by tailing slash. Reduces visual noise Almost the same as those C++ Turbo Vision fixes: https://github.com/magiblot/tvision/pull/185/
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