v2.6.0

What's Changed

• Improved JSON errors & support for alternate_filenames by @neil-morrison44 in #77

• JSON related errors now output the filename & a much better error saying what went wrong
• Adds support for alternate_filenames in core's data.json (for automatically loading alternate bioses etc)
• Correctly sets the minimum MacOS version to 11, since 10.15 isn't loading anymore
• Instance JSON building now keeps the input file's folder structure & fix for nested folders on windows

Full Changelog: v2.5.0...v2.6.0

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