Nettoyage de data

* séparation de options, calc, ...
* extraction de méthodes pour clarifier ce qui est fait dans getData
* fix de la feuille: utiliser data.data
* fix d'Actor:  update({ data.data

dev-notes.md

@@ -0,0 +1,48 @@
+# Actor notes
+
+> The Actor#getData default implementation gives you the following for use in sheet rendering:
+
+```
+  actor -> the Actor instance
+  data -> a cloned copy of Actor#data
+  items -> a cloned copy of Actor#data#items
+  effects -> a cloned copy of Actor#data#effects
+```
+
+> if all you need is a safe copy of `Actor#data`, you'll be much better off by simply defining your own function and avoiding all the wasted work that the parent class does which will slow down your sheet
+```js
+getData(options) {
+  return {
+    data: foundry.utils.deepClone(this.object.data)
+  }
+}
+```
+
+who knows, maybe you don't even need to copy your actor data, skip the copy and it's even faster:
+```js
+getData(options) {
+  return {
+    data: this.object.data
+  }
+}
+```
+
+
+Atropos19/02/2021
+There are two recommended ways to create owned items in 0.8.0:
+```js
+await Item.create(itemData, {parent: actor});
+await actor.createEmbeddedDocuments("Item", itemDataArray);
+```
+
+
+You can update an embedded item in one of two ways:
+```js
+//Method 1:
+
+const item = actor.items.get(itemId);
+item.update(data);
+
+//Method 2:
+actor.updateEmbeddedDocuments("Item", [{_id: itemId, ...}]);
+```