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This ensures we have the appropriate version before plugins call into any
gi loading.

Fixes #761

We need the display-name as it can contain pango markup, and we might need
the name without pango markup in other places.

This is different from name in that it allows for pango markup to be
assocaited with the build target.

The flatpak target cannot do everything that a regular build system
target can do, so make it obvious it is separate from the others.

Fixes #759

We use this for our internal build directory, so we want to make sure that
we don't follow it.

commands use --thread parameter instead

Fixes #758

This fixes an issue introduced by previous fixes to handle thread-selected
behavior by gdb.

Patch provided by Simone Piccardi in #748

This helps ensure our host subprocesses are reaped with Builder when it
has exited.

This renames the public API of IdeBuildManager to be build_async() which
matches the renamed symbols in IdePipeline.

This renames IdeBuildPipeline to IdePipeline and IdeBuildStage to
IdePipelineStage. Additionally, IdeBuildPhase is now IdePipelinePhase.

This should help in contributors understanding the difference between
the IdeBuildSystem components and the production pipeline and it's
components.

I didn't try very hard to keep whitespace nice, because we'll probably
do a large round of that with automation tools later and I'd rather do
that as a single pass.

Also, I renamed the execute APIs to build since execute didn't really
make sense in the concepts of a build pipeline that can
build/rebuild/clean.

I would not be surprised if there is a bit of fallout from this, so better
to get it in now than later.

Freedesktop specs: https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html#sect-Quickstart-DesktopApps

If we have not yet gotten notification of the backing file changed, and
the buffer thinks there are no local modifications, then we can skip the
save operation.

This also helps a situation where we modify a .json flatpak manifest and
invalidate the build pipelines immediately due to the inotify event.

Fixes #757

We don't want to risk cancellation of save operations just because a build
was canceled.

Related to #757