this module aims is to help manipulate complex data from bridge, mainly for the template system.
It is in common and not only in frontends as it may be used in some case by backend, if it needs to use template system in the future.
jinja integration is being rewritten to be used not only in Libervia, this is a first step which put the renderer in backend/frontends tools.
The renderer is mainly HTML oriented, but may be used for other files.
sat_templates dependency is needed to use it.
by default DBus bridge is used, but this can be changed in sat.conf's DEFAULT section using "bridge" option.
bridge can be "dbus" (or equivalent "dbus_bridge") or embedded at the moment.
Bridge name used is saved in SAT.bridge_name, and load_bridge method can be used by frontends.
