Relates to #9948.

Prevents loading of projects other than v1.0, v2.0, and also handles
error cases when attempting to load projects.

Relates to #9948.

When upgrading a project to v2.0, it is important that all source files
are in the same folder. This change makes the upgrade process verify
that this is the case and blocks the upgrade if there are source files
in multiple folders.

Source files are .kmn, .xml (ldml keyboard), .kps, and .model.ts.

For batch builds (e.g. project/compile all) of v2.0 projects, we only
want to build files that are listed in the project's $SOURCEPATH, so
that the project can contain extra folders with source file types that
won't break a project-level build.

Any source file types in extra folders can still be built one-by-one,
which is helpful for investigation and test for keyboard authors, but
will not be built if project build is selected.

This commit also formalizes the source/ SourcePath for upgraded projects
which contain a source/ folder. If the project to be upgraded does not
contain the source/ folder, then no SourcePath is assigned, and any
source file in any folder will be built.

Relates to #9948.

Having the project upgrade messages in the Messages panel means that
users can refer to them as they clean up their projects to bring them
into the v17 format.

Relates to #9948.

Identifies .xml keyboards when building file list, then shows those
appropriately in the keyboard list. Also enables grouped actions such
as keyboard_compileall for those keyboards.

Adds actions to support LdmlKeyboardEditor, and refactors and
reorganizes the existing actions along the way to make them clearer.

Compile, Install, and Uninstall supported at this time

Because the debugger actions are used only with the kmn keyboard editor,
it makes sense to keep them as a separate module, in preparation for
supporting XmlLdmlKeyboards.

Adds XmlLdml keyboard editor form based on the plain text Editor for
now.

ActiveEditor is a name used for multiple purposes. Rename to
ActiveKmnKeyboardEditor and introduce ActiveLdmlKeyboardEditor
alongside.

Removes old state load/save from each project file type, and the
unused WarnAsError property, in preparation for xmlLdmlProjectFile.

Relates to #9948.

Fixes #9869.

Adds a 'Description' field, tweaks Copyright strings, and tweaks
default content for documentation to the New Project wizards and
kmconvert.

Relates to #9948. Starts basic support for v2.0 projects.

For all operating modes:

- Remove blank projects / untitled projects mode
- Add Open Project Folder buttons and links
- Remove Project Save As
- Render uses in-memory XML
- Upgrade to v2.0 project file (along with checks)

For v2.0 projects:

- Remove 'Add File to Project'
- Populate Files to list all files in folder (note: consider efficiency
  here as currently files are parsed for subfile data)
- Version 2.0 project options and defaults

Fixes #9923.

These are no longer used because we now use kmc for builds. This also
means that the kmcomp-x64-structures test is no longer required, because
that was used to keep the Delphi and C++ structures in sync.

There are some minor details around error message identifiers that are
still present in a handful of places, but they are work for another
time.

fix(developer): enable line breaks in debugger

Merge pull request #9922 from keymanapp/fix/developer/7851-restore-selection-to-same-key-in-layout-builder

fix(developer): restore selection in layout builder even with duplicate ids

fix(developer): warn if layer switch key is missing ID

chore(developer): rename messages.ts for clarity

feat(developer): Compile button in TIKE toolbar

fix(developer): raise error if virtual key in context string

feat(developer): extract font family from .ttf in kmc-keyboard-info

Merge pull request #9914 from keymanapp/fix/developer/7852-layout-builder-maintain-presentation-during-undo

fix(developer): layout builder - maintain presentation during undo

fix(developer): enable and update unit tests

fix(developer): open editor links in new window

chore(developer): change field label to 'Related Package ID' in Related Packages dialog

chore(common): fixup SchemaValidators error handling

fix(developer): Project MRU now saves correctly

chore(developer): verify kmp.json output from kmc-package

fix(developer): debug flag for compiling keyboards

fix(developer): compiler crash when no project loaded

Merge branch 'fix/developer/9889-compiler-crash-without-project' into fix/developer/9885-debug-flag-not-working-in-tike