Add scale BrazilianGeneral

[musoke]

see discussion on PR for BrazilianCrux:

• https://github.com/OpenBeta/sandbag/pull/158/files#r1388446690
• https://github.com/OpenBeta/sandbag/pull/158/files#r1388568954
• https://www.cap.com.br/post/sistema-brasileiro-de-gradua%C3%A7%C3%A3o-de-vias-de-escalada