More avatar providers (#200)

Reload the avatar after changing it

Hide cropper after upload

Fix aspect ratio

Add loading variable

Move avatar settings to seperate component

Add avatar crop

Fix avatar upload

Add avatar file upload

Add abstract methods for file upload

Add saving avatar status

Add avatar setting

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/200

src/models/avatar.js

@@ -0,0 +1,9 @@
+import AbstractModel from './abstractModel'
+
+export default class AvatarModel extends AbstractModel {
+	defaults() {
+		return {
+			avatarProvider: '',
+		}
+	}
+}