* [gftools-packager] Slackside One: Version 1.000 added
* Slackside One Version 1.000 taken from the upstream repo https://github.com/ManiackersDesign/slackside.git at commit e5a03bb81c.
* [gftools-packager] ofl/slacksideone remove METADATA "source". google/fonts#2587
* Update METADATA.pb
* slacksideone: Update OFL.txt
Co-authored-by: Marc Foley <m.foley.88@gmail.com>