string_hash_ops_free everywhere, so that destruction is implicit rather than
explicit. Similar, for other special hashmap/set/ordered_hashmap destructors.
+* generators sometimes apply C escaping and somethines specifier escaping to
+ paths and similar strings they write out. Sometimes both. We should clean
+ this up, and should probably always apply both, i.e. introduce
+ unit_file_escape() or so, which applies both.
+
Deprecations and removals:
* Remove any support for booting without /usr pre-mounted in the initrd entirely.