flatpak: update build-manifest to retrieve dependencies without initial download phase: - dependencies are now entirely retrieved from the installation, and requirement are build from there. The source package is currently always used, and it is now possible to use PYTHON_DEP_PREINSTALL to add extra packages or use a specific version of a package. - fixed insertion of `release_elt` for dev version at the right location. - `branch` is not set anymore for stable versions. - libxslt is not added anymore as it is part of freedesktop runtime - flathub share-modules is now used for Python 2

# Font Squirrel Font-face Generator Configuration File
# Upload this file to the generator to recreate the settings
# you used to create these fonts.

{"mode":"easy","formats":["ttf","eot","woff","svg"],"options_hinting":"Y","options_vertical_metrics":"Y","options_kerning":"Y","options_subset":"basic","subset_custom":"","subset_custom_range":"","css_format":"fontspring","filename_suffix":"webfont","emsquare":"2048","spacing_adjustment":"0"}