project: Use org.gnome prefix in app id and adapt to changes

In preparation to moving to GNOME all the IDs, DBus object paths, etc should
change.

Closes #303

data/org.gnome.Calls-daemon.desktop.in

@@ -0,0 +1,16 @@
+[Desktop Entry]
+Name=Calls (daemon)
+GenericName=Phone
+Comment=A phone dialer and call handler (daemon mode)
+# Translators: These are desktop search terms. Do not translate semicolons, end line with a semicolon.
+Keywords=Telephone;Call;Phone;Dial;Dialer;PSTN;
+# Translators: Do NOT translate or transliterate this text (this is an icon file name)!
+Icon=org.gnome.Calls
+TryExec=gnome-calls
+Exec=gnome-calls --daemon
+Type=Application
+StartupNotify=true
+NoDisplay=true
+Terminal=false
+Categories=Network;GNOME;GTK;Telephony;
+X-GNOME-AutoRestart=true