Beta version with most of the primary features finished.
- implemented drag&drop reordering for the preset list
- reworked the drag&drop reordering and file dropping in the mod list
- fixed restoring of additional command line arguments
- fixed restoring of the "use absolute path" option
- engine name is now derived from directory name instead of executable name
- added "clone preset" button
- added an option to select a configuration file
- added file filters for file dialogs
- few minor bug fixes