Lot's of "quality of life" improvements, reliability improvements and Linux support improvements.
- added new launch options for video, audio and save/screenshot directory
- added tooltips for some of the launch options
- map names are now extracted from IWAD file instead of guessing them from IWAD name
- added confirmation dialog when attempted to delete a preset
- enabled keyboard control (Enter, Insert, Delete, CTRL+arrows)
- right-click inside an editable list widget pops-up a context menu with available actions
- added "close on launch" option
- before launch, the current directory is changed to engine's directory, improving compatibility with some engines
- options.json is now saved into /home/user/.config/DoomRunner in Linux
- bugfixes related to config file selection