zDoom Launcher v1 p4 Fourth update

Changes:

1. All directories where launcher looks for loadable files are saved into config file.
2. Launch configurations are now saved in Xml format and take less space on the hard drive.
3. Added ability to load maps by their names when starting a game.
4. Added an icon for the program.

Fixes:

1. Fixed the launcher not updating the fields that contain information about what to do when starting a game when loading the configuration.
2. Fixed a crash when entering non-numeric characters into spinner controls without any digits.
3. Fixed the link to Fugue Icons.
4. Fixed the support for custom save directory and config file.