Doom Runner v0.9-beta

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