Switch to new package format

info.yml

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+name: xfce4
+description: The Xfce Desktop Environment
+version: "4.20"
+revision: 5
+url: https://www.xfce.org/
+maintainers:
+  - [email protected]
+architecture: any
+type: source
+runtime_depends:
+  - exo
+  - garcon
+  - thunar
+  - thunar-volman
+  - tumbler
+  - xfce4-appfinder
+  - xfce4-panel
+  - xfce4-power-manager
+  - xfce4-session
+  - xfce4-settings
+  - xfce4-terminal
+  - xfconf
+  - xfdesktop
+  - xfwm4
+  - xfwm4-themes
+replaces:
+  - xfce