[FEATURE] Final2x CORE. Add option to disable opening output folder

[MarcG2]

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Final2x-core opens the output directory after running. This behavior is very undesirable in some cases. If running multiple instances in parallel, Final2x-core will repeatedly try to open the same folder, resulting in many Windows errors.

Please add an option to disable this behavior.

Detail | 详细描述 | 詳細な説明

Please add an option to disable opening the "outputs" folder.

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