refactor(developer): cleanup kmn compiler message namespaces

docs(developer): kmc-kmn api documentation and some message documentation

Merge pull request #10819 from keymanapp/chore/common/9843-keyman-touch-layout-schema-restrictive-layer-id

chore(common): loosen .keyman-touch-layout schema layer id requirements

fix(developer): make sure scroll bar appears when needed in global welcome

auto: increment beta version to 17.0.280

chore(resources): update to latest ldml: xmlns, uset

Merge branch 'docs/developer/10207-kmc-kmn-documentation' into refactor/developer/10207-kmn-compiler-message-namespaces

fix(linux): Fix libkeymancore-dev dependencies

Co-authored-by: Steven R. Loomis <srl295@gmail.com>

auto: increment beta version to 17.0.279

This change adds `libicu-dev` as a dependency for `libkeymancore-dev`.
While it is possible to dynamically build without ICU it is required
when doing a static build.

Closes #10864 and [Debian bug #1064915](
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1064915).

fix(android/engine): Check selection indexes

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

chore(android/engine): Reduce toast notifications after installations

docs(linux): Updated whatsnew for Keyman for Linux 17

Co-authored-by: Darcy Wong <darcy_wong@sil.org>

Remove Toast notifications for:
* Dictionary download is finished
* Resources successfully updated

Fixes: rename unicodeSet to uset 🙀  #10657

chore(developer): rename unicodeSet to uset 🙀  #10657

- add xmlns to schema manually

For: chore(developer): support xmlns on keyboard3 files 🙀  #10803

This is in preparation for message documentation.

Moves all messages with the KmnCompiler namespace into
KmnCompilerMessages. For now, keeps CompilerMessages class as a subclass
of KmnCompilerMessages, for removal in 18.0.

Moves messages with KmnCompiler namespace from kmw-compiler-messages.ts
to kmn-compiler-messages.ts. This avoids confusion as to source of
message, and should allow us in the future to split the classes
entirely.

- maybe last 'techpreview' update

Unblocks: chore(developer): support xmlns on keyboard3 files 🙀  #10803
Unblocks: chore(developer): rename unicodeSet to uset 🙀  #10657

For: #10803

auto: increment beta version to 17.0.278

Closes #10715.

docs(developer): add documentation for kmc-analyze

fix(developer): repeated options in kmc must now be fully specified

chore(linux): Update debian changelog

Relates to #10207.

Adds basic documentation for the API surfaces for kmc-kmn, and provides
documentation for a small subset of compiler messages.

Relates to #10207.

refactor(developer): move osk module from common-types to developer-utils 📚

docs(developer): npm package readme files 📚