Dottorrent

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* [FIX] incorrect enumeration of settings file path in portable mode

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* [ENHANCEMENT] Remember more GUI state (https://github.com/kz26/dottorrent-gui/pull/21)

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* [FIX] crash when creating single-file torrent with batch mode enabled (https://github.com/kz26/dottorrent-gui/issues/20)
* [CHANGE] Minor code cleanup

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* [NEW] Implement portable mode
* [FIX] Minor UI behavior fixes

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* [FIX] Paste from clipboard with quoted paths (https://github.com/kz26/dottorrent-gui/issues/16)
* [FIX] Properly set file/directory radio button state on clipboard paste event
* [CHANGE] Require dottorrent 1.9.2 or higher

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* [FIX] Odd window resizing behavior on reset