Beta 2.077.0

[Martin Nowak]

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First beta for the 2.077.0 release.

This release comes with a new, more compact mangling, templated vector
operations, reproducible dmd builds, and various fixes.

http://dlang.org/download.html#dmd_beta
http://dlang.org/changelog/2.077.0.html

We also switched dlang to use `-beta.1`, `-rc.1` suffixes for
pre-releases, matching dub and semver.

Please report any bugs at https://issues.dlang.org

- -Martin

NB: Switching dlang to use semver is in discussion, but required to
adapt the release and development processes (also see
https://gist.github.com/mdparker/ab61a1309752905cf93acb2653c50beb).
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