Small QOL Fixes

Full Changelog: 1.5.8...1.5.9

New GUI

Full Changelog: 1.5.0...1.5.8

Fix File Dialog

Due to weird tkinter behavior if you cancel the file dialog menu, it will return empty string and wipe our input / output fields.

Better logging

More informative messages.

GUI Optimizations

• Even faster startup and file processing.
• Basic progress bar.

GUI Touchups

• Multi threading support, when enabled files will be processed MUCH faster.
• Updated color scheme.
• Now gui will save Input, Output, disable multi-threading, log level fields and windows size.
• Fix open directory for linux.

Advanced settings:

• Disable kf checks (for other UE2 based games).
• Edit extension list.