Log message:
archivers: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Could not be committed due to merge conflict:
devel/py-traitlets/distinfo

The following distfiles were unfetchable (note: some may be only fetched
conditionally):

./devel/pvs/distinfo pvs-3.2-solaris.tgz
./devel/eclipse/distinfo eclipse-sourceBuild-srcIncluded-3.0.1.zip

Log message:
devel: Remove SHA1 hashes for distfiles

Log message:
range-v3: Don't install modulemap file

Log message:
devel: Add range-v3

Range library for C++14/17/20. This code was the basis of a formal proposal
to add range support to the C++ standard library. That proposal evolved
through a Technical Specification, and finally into P0896R4 "The One Ranges
Proposal" which was merged into the C++20 working drafts in November 2018.

Ranges are an extension of the Standard Template Library that makes its
iterators and algorithms more powerful by making them composable. Unlike
other range-like solutions which seek to do away with iterators, in range-v3
ranges are an abstration layer on top of iterators.