general: Rename to Loupe

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

Cargo.lock

@@ -652,28 +652,6 @@ dependencies = [
  "system-deps 3.2.0",
 ]
 
-[[package]]
-name = "gnome-image-viewer"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "ashpd",
- "cairo-rs",
- "gdk-pixbuf",
- "gdk4",
- "gettext-rs",
- "gio",
- "glib",
- "gtk-macros",
- "gtk4",
- "libadwaita",
- "log",
- "once_cell",
- "pretty_env_logger",
- "zbus 1.9.1",
- "zvariant",
-]
-
 [[package]]
 name = "gobject-sys"
 version = "0.14.0"
@@ -933,6 +911,28 @@ dependencies = [
  "cfg-if 1.0.0",
 ]
 
+[[package]]
+name = "loupe"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "ashpd",
+ "cairo-rs",
+ "gdk-pixbuf",
+ "gdk4",
+ "gettext-rs",
+ "gio",
+ "glib",
+ "gtk-macros",
+ "gtk4",
+ "libadwaita",
+ "log",
+ "once_cell",
+ "pretty_env_logger",
+ "zbus 1.9.1",
+ "zvariant",
+]
+
 [[package]]
 name = "malloc_buf"
 version = "0.0.6"