Fix a bunch of smaller install/build issues

- Correctly install the sidecar app desktop files (RAWPlayer, etc)
- Add support for supplying a resolve.zip to skip download and speed up
  testing
- Fix metainfo build
- Fix typos
- Fix duplicate .desktop definition
- Fix PrefersNonDefaultGPU setting

com.blackmagic.Resolve.desktop

@@ -1,6 +0,0 @@
-[Desktop Entry]
-Type=Application
-Name=Davinci Resolve
-Icon=com.blackmagic.Resolve
-Exec=/app/bin/resolve.sh
-PrefersNonDefaultGPU=true