Enable injecting optional properties that are only fulfilled when ava…
…ilable (#168)
It can be really useful to share an `@Instantiable` across boundaries
where only some of their properties exist

Bump to 1.2.3

Undo unnecessary change

Bump to 1.2.2

Only write the dependency tree output file if it has changed (#167)
@ahmdmhasn had a great idea to not touch the output file if the output
file's content hasn't changed. Looks like modern Xcode seems to support
having a package plugin that does supports this, so let's do it.
I believe earlier SPM implementations required the output file to be
touched as part of the build plugin run, so we _needed_ to write the
file. This does not seem to be the case in Xcode 16+.
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Co-authored-by: Ahmed M. Hassan <45182214+ahmdmhasn@users.noreply.github.com>

Example adopts latest release candidate

Improve whitespace in initializer FixIt (#166)

Enable Xcode to properly parse property assignments

Enable FixIt to update existing initializer rather than always provid…
…ing a new one (#164)
When an `@Instantiable` does not have a properly formatted `init`, and
one of the type's `init` methods only is missing arguments or has
incorrect/missing accessibility modifiers, our FixIt now updates an
existing `init` method rather than creating a new one.

Delete existing file before moving file to same location -- outside o…
…f Xcode