Commit 0722781fc updated the app to use `DevAppName` for the
app's window title when it was a non-official build, based on
the state of `IsStoreBuild`.
Unfortunately, `IsStoreBuild` is a _project_ level variable defined in
[build-app-internal.yaml](0722781fc6/build/pipelines/templates/build-app-internal.yaml (L36)),
but not a _compile-time_ defined value.
To solve this, we are now defining `IS_STORE_BUILD` in
`Calculator.vcxproj` when `IsStoreBuild='True'`, the same way that
we set `SEND_DIAGNOSTICS` for official builds, and we'll change the
window title based on that new `#define`.
Using this new `#define` can lead us down a slippery slope. We need to
limit the amount of divergent code that we have between dev/official
builds. This should be hopefully one of very few instances where
this value is ever used.
c994e49279