"scalable" icons directory should only be used for scalable (vector) image formats

[audreytoskin]

A minor issue, but I think this mismatch might be affecting how Lector appears in the "app stores" for the distros where it's been packaged...

By default on Linux, Lector installs its Lector.png icon under /usr/share/icons/hicolor/scalable/apps/. However, That "scalable" subdirectory is supposed to only be used for scalable (vector) image formats -- on my system, basically every other image in that directory is an SVG, not a PNG.

Since, Lector.png is a 512×512-pixel raster image, I think it should get installed to /usr/share/icons/hicolor/512x512/apps/ instead. (The downside here being if you replaced it with a larger image, you would need to move it to the the matching directory.)

Or, you could use the scalable directory if you had an SVG version of the Lector icon.

[audreytoskin]

...Or maybe it would be better to use ./lector/resources/raw/logo/icon.svg instead? It's a nicer-looking image, and is also newer by about a year, so I suddenly wonder if ./lector/resources/raw/Lector.png is just leftovers from an older design that otherwise isn't used anymore.