New feature: Application directory (AppDir)

Closed Antoine Le Gonidec requested to merge dev-2.12/library/feature/appdir into staging-2.x

Original merge requests: !194 (closed) !193 (closed)


Fix #117 (closed)

Tested for Dosbox only. Other game types would probably need some minor changes.


Needs rebasing on 2.11.2

Edited by Andrey

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