general: Rename to Loupe

Sets the codename, binary name, and app ID name to Loupe.
The user-visible name is still Image Viewer.

build-aux/flatpak/org.gnome.ImageViewer.Devel.json

@@ -1,67 +0,0 @@
-{
-    "app-id" : "org.gnome.ImageViewer.Devel",
-    "runtime" : "org.gnome.Platform",
-    "runtime-version" : "master",
-    "sdk" : "org.gnome.Sdk",
-    "sdk-extensions" : [
-        "org.freedesktop.Sdk.Extension.rust-stable"
-    ],
-    "command" : "gnome-image-viewer",
-    "finish-args" : [
-        "--share=network",
-        "--share=ipc",
-        "--socket=fallback-x11",
-        "--socket=wayland",
-        "--device=dri",
-        "--filesystem=host",
-        "--env=RUST_BACKTRACE=1",
-        "--env=RUST_LOG=gnome_image_viewer=debug"
-    ],
-    "build-options" : {
-        "append-path" : "/usr/lib/sdk/rust-stable/bin",
-        "build-args" : [
-            "--share=network"
-        ],
-        "env" : {
-            "CARGO_HOME" : "/run/build/gnome-image-viewer/cargo"
-        }
-    },
-    "cleanup" : [
-        "/include",
-        "/lib/pkgconfig",
-        "/man",
-        "/share/doc",
-        "/share/gtk-doc",
-        "/share/man",
-        "/share/pkgconfig",
-        "*.la",
-        "*.a"
-    ],
-    "modules" : [
-        {
-            "name" : "libadwaita",
-            "buildsystem" : "meson",
-            "sources" : [
-                {
-                    "type" : "git",
-                    "url" : "https://gitlab.gnome.org/GNOME/libadwaita.git",
-                    "branch" : "main"
-                }
-            ]
-        },
-        {
-            "name" : "gnome-image-viewer",
-            "builddir" : true,
-            "buildsystem" : "meson",
-            "config-opts": [
-                "-Dprofile=development"
-            ],
-            "sources" : [
-                {
-                    "type" : "git",
-                    "url" : "https://gitlab.gnome.org/BrainBlasted/gnome-image-viewer.git"
-                }
-            ]
-        }
-    ]
-}