Switch to new download format, update source.sh script and remove systemd directory

pkg.info

@@ -1,10 +1,22 @@
 name: tumbler
 description: D-Bus service for applications to request thumbnails for various URI schemes and MIME types
 version: 4.21.0
+revision: 2
 url: https://docs.xfce.org/xfce/tumbler/start
 license: GPL2-or-later
 architecture: any
-depends: ["gdk-pixbuf","libxfce4util"]
-optional_depends: ["freetype2"]
-make_depends: ["freetype2","meson","python3"]
 type: source
+depends:
+  - gdk-pixbuf
+  - libxfce4util
+optional_depends:
+  - freetype2
+make_depends:
+  - freetype2
+  - meson
+  - python3
+downloads:
+  - url: https://gitlab.xfce.org/xfce/tumbler/-/archive/tumbler-${BPM_PKG_VERSION}/tumbler-tumbler-${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: be8f2a001a2695f6a8b027a7697c98d542da0f2dcc7c34cb25b1b1e5ecac406f