Add build support for M1 (ARM for Macs) & Big Sur (macOS 11)

Support needs to be added for building on macOS 11 and M1 (Apple ARM based CPU / Apple Silicon).

I didn't see any other tickets on the subject, so I am not aware if anyone with early access to an ARM based Mac has made any headway here?

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information