VENOM-366: Convert flatpak manifest to yaml

[naxuroqa]

• YAML should be IMO better readable and maintainable
• Add some build options to optimize builds
• Disable building static tox library

[codecov-io]

Codecov Report

Merging #366 into develop will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #366   +/-   ##
=======================================
  Coverage     20.7%   20.7%           
=======================================
  Files           90      90           
  Lines         5235    5235           
=======================================
  Hits          1084    1084           
  Misses        4151    4151

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