WIP: Port the buildsystem from flatpak-builder to BuildStream

Tomaz Canabrava requested to merge work/qt5.14-buildstream-test into qt5.14

This is a beginning of a proposal to por KDE flatpak buildsystem from flatpak-builder to buildstream.

The reasoning is to be able to use the same technology behind freedesktop-sdk, and it gives us a few benefits like the hability to use a cache server, so we don't need to rebuild every single package, and the ABI and CVE checker plugins. This can also be extended in the future to support both flatpak and snaps, reducing code complexity trough the codebase.

More info: #6

Edited by Tomaz Canabrava

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