fix the issue that cannot start when last script is not exists
When "Automatically load the last script" is checked in the settings dialog and apply settings, vsedit will not start when last script is not exists, and it just show "QMessageBox::critical".
fix the issue that segfault when it is close.
don't load vsedit_logger.dll when it's not on windows.
fix segfault on startup (QT 5.15.2) (https://bitbucket.org/gundamftw/vapoursynth-editor-2/issues/2/segfault-on-startup-qt-5152)
fix the issue that cannot start when last script is not exists
When "Automatically load the last script" is checked in the settings dialog and apply settings, vsedit will not start when last script is not exists, and it just show "QMessageBox::critical".
fix the issue that segfault when it is close.
don't load vsedit_logger.dll when it's not on windows.
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