Improve searchability by renaming ART (eg, ARTherapee)

ART doesn’t show up in search results because “art” is a generic word. Even “art raw” doesn’t return the desired results. “art raw processor” and “art rawtherapee” do give the desired result. The problem is similar when searching for packages in software repositories.

Renaming to something like ARTherapee would improve searchability with minimal changes elsewhere since the name abbreviation is unchanged.