revamp of the info_walk, info_graph_init and info_graph_display function. Add info_graph_service function

rename service_resolve_svtree function to service_intree. Rename struct ss_resolve_graph_style to info_graph_style

complete reframe of resolve API function: allow to use different struct of resolve in function of the object to deal with. Split service and tree resolve function to separated file.

[WIP] Implementation of new graph API. Implements seed file features. Use new interface of sastr_dir_get.

change interface of tree_sethome() function and allow creation of the tree by seed file, add prototype declaration for tree_seed_xxx function() and ss_tree_seed_s struct