Features:
+* bootctl: add "gc" verb that loads all type #1 .conf files, and then removes
+ all files from the set of files matching the entry token that are not
+ referenced by any.
+
+* networkd/udevd: add a way to define additional .link, .network, .netdev files
+ via the credentials logic.
+
+* fstab-generator: allow definining additional fstab-like mounts via
+ credentials (similar: crypttab-generator, verity-generator,
+ integrity-generator)
+
+* getty-generator: allow defining additional getty instances via a credential
+
+* run-generator: allow defining additional commands to run via a credential
+
* define a JSON format for units, separating out unit definitions from unit
runtime state. Then, expose it: