Collections (#688)

* initial draft; unfinished

* images, fixes

* fixes

* println

* revisions

* fixes

* alternate context setup version

* rev

* partial revs

* rev

* clippy ,fmt

* fmt/clippy/prepare

* fixes

* revs

src/models/mod.rs

@@ -1,6 +1,8 @@
 pub mod analytics;
+pub mod collections;
 pub mod error;
 pub mod ids;
+pub mod images;
 pub mod notifications;
 pub mod pack;
 pub mod pats;