v2.8.1-rc.1

Security

• CVE-2021-40394: Gerbv RS-274X aperture macro outline primitive integer overflow vulnerability, discovered by the @CiscoTalos team in issue #57 fixed by @ooxi in PR#61

gerbv

• Various spelling and desktop integration fixes (PR#69 by @tijuca)
• Live update of viewer via x&y translation spinbuttons on layer edit window (PR#70 by @Rix)