appdata: Improve appdata for AppStream 1.0 (#222)

* appdata: Improve appdata for AppStream 1.0

- Add the `<developer><name>` tag
- Mark the `<developer_name>` tag as deprecated
- Improve appstreamcli parameters
- Activate meson tests on Flatpak manifest

* Change developer ID to kramo.hu

---------

Co-authored-by: kramo <93832451+kra-mo@users.noreply.github.com>

flatpak/hu.kramo.Cartridges.Devel.json

@@ -123,6 +123,7 @@
             "name" : "cartridges",
             "builddir" : true,
             "buildsystem" : "meson",
+            "run-tests" : true,
             "config-opts": [
                 "-Dprofile=development"
             ],