Added entries for all the changes since 3.8.1

[softins]

This is the first draft of the ChangeLog additions since 3.8.1, for review and comment.

It was produced while examining the output of git log --graph master...r3_8_1

[softins]

I have verified that all the users mentioned in this section of the ChangeLog are already in the contributors list in src/util.cpp.

[ghost]

@vibraphon provided a picture of his home built vibraphone for Jamulus. Please update the ChangeLog to give @vibraphon photograph credit for the vibraphone icon.

• Client: Added Vibraphone to list of instruments (Add Vibraphone icon to instruments. #2080, Add transparency to vibraphone icon #2158).
  (contributed by @DavidSavinkoff, @softins)

[hoffie]

One minor nit.

Cross-checked completeness via some new tooling (will send a PR shortly):

$ ./tools/is-changelog-complete.sh 
Checking if all Github PRs since 3.8.1 are included for 3.8.2...
-> Missing PR #2249 (Added entries for all the changes since 3.8.1)
Checking if all Github Issues since 3.8.1 are included for 3.8.2...
-> Missing Issue #2247 (Prepare Release 3.8.2)
-> Missing Issue #2214 (Accelerator key collision in several languages)
Checking if all PR or Issue references in git log since r3_8_1 are included for 3.8.2 based on ref origin/master...
-> Missing PR #2221 from git log (Minor correction to PR template)
-> Missing PR #1993 from git log (Fix for #1688 - unicode in mixer should wrap on character boundaries)

#2214 should either be de-tagged or must be remembered for inclusion in the Changelog.
All other "findings" are not Changelog-worthy, so this is fine.

CHANGELOG: SKIP

[softins]

@hoffie, thanks!

-> Missing Issue #2214 (Accelerator key collision in several languages)

#2214 should either be de-tagged or must be remembered for inclusion in the Changelog.

#2214 can only be addressed fully after the translation cycle. #2248 addressed it for English.

[softins]

-> Missing PR #1993 from git log (Fix for #1688 - unicode in mixer should wrap on character boundaries)

Why is #1993 listed here? It was tagged for 3.8.1, not 3.8.2, but was actually closed, not merged, and replaced with #1994. Just thought it might be something to check in your tools.

[gilgongo]

Seeing as this is an installer thing, can we also put the Mac client install fix below this? It's the main thing for Mac users in this release.

[gilgongo]

Oh wait it's merged - I'll do it myself :-)