Tweaked gradient turbo.
Use XTest as a fallback option.
Take multiple direction buttons into account when changing sets.

Related to issue #153.
Corrected help text used in window.
Add check for existing files when loading recent profile list.
Raise priority of entire process on Windows. Raise idle timer for mouse.
Changed WinInfo to WinExtras.
Renamed X11Info to X11Extras.
Reduce main thread priority for Unix systems.
Fixed compile error.