container children is a function pointer
store the root inside each item
didl: new API

The didl use ixml API to build the xml contain
cds use the new didl API
didl remove old API
didl change copyrights (no old code present)
UPNP state variables: "get" returns freeable string
move cds searching and browsing functions to vfs
Merge branch 'vfs_children' into didl_new

Conflicts:
	src/cds.c