Version and Source are linked properties: in Discover, one is always related to and affected by the other.

This patch displays them together as a single piece of metadata to better communicate the connection, and also as a necessary first step towards possibly using a combobox to change the version.

Supersedes D9976

Tested in KDE Neon. The presentation is best when the version number and source names are short, which generally seems to be the case for every circumstance except Ubuntu-based packaging, as Ubuntu often has really long repo names and provides absurd and borderline incomprehensible version numbers. Even in this worst-case scenario, it's still not too bad IMHO.

Krita, before:

Krita, after:

Blender, before:

Blender, after:

Corebird, before:

Corebird, after:

Discord, before:

Discord, after:

Firefox, before:

Firefox, after:

GNOME Recipes, before:

GNOME Recipes, after

K3b, before:

K3b, after:

Lincity-NG, before:

LinCity-NG, after: