Arbitrary data in Memory using Any, fix #255 (#257)

* init work

* implement deferred deserialization

* many improvements
* rename `DataElement` -> `AnyMapElement`
* make `data` in `Memory` as public field of type with public interface
* make interface more rich
* transform most unwraps to proper error handling
* make `AnyMap` store by `TypeId`, so now individual type can be counted and reset

* improve storing TypeId between different rust versions

* rewrite system widgets to use AnyMap

* refactor everything
* replace `serde_json` -> `ron`
* move `any_map` to module
* separate `AnyMap` into `AnyMapId` and `serializable::AnyMapId` in order to not require `serde` traits in methods
* add `AnyMap` and `serializable::AnyMap` that stores elements just by type, without `Id`
* write documentation
* change tooltips and color picker to use `Memory::data_temp`

* fix bugs and docs

* Apply suggestions from code review

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

* rename `AnyMap` → `TypeMap`

* rename `AnyMapId` → `AnyMap`, add generic <Key> to it

* rename files `id_map` → `any_map`

* move out usages from `serializable` mod

* rename `ToDeserialize` → `Serialized`

* fix bug with counting

* add tests, and...
* rename `reset` → `remove`
* add function `remove_by_type`
* format code

* improve code
* make identical interface for serialized and simple maps
* make serialized maps serialized fully, without features by moving this into `Memory` struct with `#[cfg(feature = "persistence")]` under fields
* move `serialized::TypeId` into `AnyMapElement` struct

* fix pipeline and add one more test

* update docs

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

Cargo.lock

@@ -756,7 +756,9 @@ name = "egui"
 version = "0.11.0"
 dependencies = [
  "epaint",
+ "ron",
  "serde",
+ "serde_json",
 ]
 
 [[package]]