Node graph improvements (#855)

* Selecting multiple nodes

* Improve logs

* Log bad types in dyn any

* Add (broken) node links

* New topological sort

* Fix reorder ids function

* Input and output node

* Add nodes that operate on images

* Fixups

* Show node parameters together with layer properties

* New nodes don't crash editor

* Fix tests

* Node positions backend

* Generate node graph on value change

* Add expose input message

* Fix tests

Co-authored-by: Keavon Chambers <keavon@keavon.com>

Cargo.lock

@@ -223,6 +223,7 @@ name = "dyn-any"
 version = "0.2.1"
 dependencies = [
  "dyn-any-derive",
+ "log",
 ]
 
 [[package]]
@@ -398,6 +399,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
+ "serde",
  "syn",
 ]