We begin the GNOME 40 development cycle by adding the ability to define
a development build of Dictionary, with its own application identifier.

We use the same application identifier across the binary, so that the
shell can match our desktop file with it; and we use a different label
in the About dialog, depending on whether we are using a development
build or not.

It's possible to enable the development build by using a build option;
otherwise, we're going to check if the current version is one of the
three development stages of a GNOME release.