refactor(web): converts test_utils funcs to Promise use 🤝

chore(web): centralizes web-based modules' CI unit test configurations 🤝

auto: increment master version to 16.0.43

chore(common): GitHub issue template tweaks

fix(developer): rebuilding a model would not refresh it in server 🎾

fix(developer): increase maximum file size for server 🎾

Just incorporates some additional fields and instructions that I have
noted over time.

@keymanapp-test-bot skip

feat(developer): add languageUsesCasing to Model Editor

auto: increment master version to 16.0.42

chore(linux): Add code comment

When rebuilding a model, Keyman Developer would query for the
registered model, but a missing simplifyId call meant that it never
matched the model name (due to `.` vs `_`).

chore(common): builder script `:target` and `--option` support

auto: increment master version to 16.0.41

Follow-up of PR #6997.

chore(linux): Add script to upload to debian

Somehow missed this with the previous commit.

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

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

Fixes #7007.

Default action is 'build' unless overridden in builder_describe.
Default target is all targets when no target is specified in command-
line.

auto: increment master version to 16.0.40

This change also slightly modifies `echo_heading` and outputs a
mark. This will show to the left of the line as well as in the
scroll bar in a terminal in VSCode [[1]] and will help to find the
headings if you have a lot of output in between.

[1]:https://code.visualstudio.com/updates/v1_69#_setmark-sequence-support