Switch to new download format, add bpm hook and update source.sh script

pkg.info

@@ -1,9 +1,17 @@
 name: desktop-file-utils
 description: CLI utilities for working with desktop entries
-version: 0.28
+version: "0.28"
+revision: 2
 url: https://www.freedesktop.org/wiki/Software/desktop-file-utils/
 license: GPL
 architecture: any
-depends: ["glib"]
-make_depends: ["meson"]
 type: source
+depends:
+  - glib
+make_depends:
+  - meson
+downloads:
+  - url: https://www.freedesktop.org/software/desktop-file-utils/releases/desktop-file-utils-${BPM_PKG_VERSION}.tar.xz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 4401d4e231d842c2de8242395a74a395ca468cd96f5f610d822df33594898a70