Backend: Don't write features file anymore

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
backend: Remove unused import

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
Merge branch 'unstable' into wip-no-feature-file
Main window: Fix all boxes visibility toggling

Signed-off-by: Jerome Flesch <jflesch@wyplay.com>
Merge branch 'unstable' into wip-no-feature-file
Merge branch 'unstable' into wip-no-feature-file
Merge branch 'wip-no-feature-file' into unstable