Fixes #8615.

The msgproc was never being located as we were missing the UTF8ToString
wrapper for the context.

This also ensures error message codes are emitted in hexadecimal, and
that the return value from the msgproc callback is 1, meaning 'continue
build'.

auto: increment master version to 17.0.90

fix(developer): add missing dependencies

docs(ios): Add help page for Settings

chore(developer): tweak build of extension list in kmc

auto: increment master version to 17.0.89

docs(android): Update Linux dev environment for Java 11

Per review comment

Co-authored-by: Marc Durdin <marc@durdin.net>

Co-authored-by: Joshua Horton <jahorton@sil.org>

docs: adds extra links for new help pages

auto: increment master version to 17.0.88

chore(common): add missing deps and files for npm publish

fix(common): consolidate npm publishing

fix(developer): improve 'does not exist' error message

fix(developer): kmc should not validate as well as compile keyboard

chore(developer): kmc-kmn should build all baseline fixtures

refactor(developer): DRY kmc module references

auto: increment master version to 17.0.87

The build/ folder for most packages was missing due to being listed in
.gitignore.

Also, @keymanapp/ldml-keyboard-constants package was not being published
despite being a dependency of @keymanapp/kmc-keyboard.

Instead of relying on npm's use of .gitignore / .npmignore (which has
seriously wonky behaviours), we list the files that should be included
in package.json.

NPM Wonky behaviours: it seems that .npmignore causes .gitignore in the
same folder to be ignored. But, higher level .gitignore files still
affect the files included in the package, which makes
specification-by-exclusion painful (negating exclusions, etc). We do not
recommend use of .npmignore anywhere for this reason.

Fixes #8586.

All npm publish actions in the repository are now run as part of the
Developer release build, hosted at present by kmc, until we setup a
higher-level build script to do it.

Adds a 'pack' action which mirrors 'publish' for all npm packages.

Removes unnecessary dev dependencies of models-templates and
models-wordbreakers from kmc-model.

Web Release build CI step has been updated to check for presence of
.build-builder.

Fixes #7310.

docs(windows): link to wiki architecture faq page

auto: increment master version to 17.0.86

Fixes #8508.

Fixes #8512.

Note: the compile phase is identical to the validation phase at this
point, so no need to run validate prior to compile.

Fixes #8540.