flatpak: update files following names change + Python 3 update: - `build_manifest.py` has been fixed to work with recent SàT/Libervia - filenames/scripts have been udpated to reflect project name change - installation now uses `requirements.txt` when dev version is requested - there are now 3 types of commands wrapper: * `libervia_wrapper.py` uses `pb` bridge, starts backend before frontend, and stops it when frontend is stopped. It's used by `Libervia Desktop` (Cagou) * `libervia_wrapper-dbus.py` uses `dbus` bridge, starts backend before frontend, and stops it when frontend is stopped. It's used for `Libervia TUI` (Primitivus) * `libervia_wrapper-dbus.py` uses `dbus` bridge, starts backend if necessary and doesn't stop it (to avoid waiting for backend start next time). It's used by `Libervia CLI` (jp).

{
    "_build_settings": {
        "package": "sat",
        "wrapped_command": "libervia-tui",
        "wrapper_template": "libervia_wrapper-dbus.py",
        "dev_repos": {"type": "hg", "url": "https://repos.goffi.org/sat"},
        "icon": "https://repos.goffi.org/sat_media/raw-file/tip/icons_svg/sat.svg",
        "desktop_file": "org.libervia.LiberviaTUI.desktop",
        "appdata_file": "_tpl_org.libervia.LiberviaTUI.appdata.xml"
    }
}