Old Mac version support.

[wangdong20]

Is your feature request related to a problem? Please describe

My Mac is version 12.x.x, but this software only support 14.x.x.

Describe the solution you'd like

Please add support for Mac 12.x.x

Describe alternatives you've considered

Additional context

[orbitalmartian8]

Hi there, Libresprite supports MacOS version 11+. We can’t provide anything older, 1: dependencies, 2: Apple is weird with this sort of things.