8 digits with slash symbols used in music notation

[eggrobin]

See L2/23-277 Unicode request for Unicode request for numbers with slashes used in figured bass, https://github.com/unicode-org/sah/issues/346, L2/24-013 Section 10.

UTC-178-C31 Consensus: Provisionally assign 8 digits with slash symbols used in music notation in the range U+1D1F7..U+1D1FE, as proposed in L2/23-277. [Ref. Section 10 of L2/24-013R]

UTC-180-C38 Consensus: Change the name of the provisionally assigned characters U+1D1F7..U+1D1FE to replace the word "SLASH" with "STROKE" [Ref. Section 17 of document L2/24-166]

https://github.com/unicode-org/utc-release-management/issues/96