Notification UI to display errors, warnings, activities

[lexoyo]

Create a grapesjs plugin to display notifications: errors, warnings, activities.

UI: cf webflow and bubble

API: editor.Notifications.getAll(), editor.Notifications.add({type: 'warning', title: 'test', description: 'blabla', link: '...'}) ...

Features:

• [x] links should bring the user to the component or settings in error. Implement a "deeplink" strategy for selection and settings in silex?
• [x] Keep only the last NUM_NOTIFICATIONS
• [x] make them persistant with localstorage
• [x] Group them by similar message
• [x] Update persistant notification (saving... Saved)

Implement these errors:

• [x] onboarding plugin in editor.silex.me
• [x] links in error (after deleting page, cf FIXME in the code of the internal links plugin)
• [ ] Save/load status
• [x] check all errors / console.error in the code
• [x] image could not be loaded
• [ ] publication errors

Implement these activities:

• [ ] deleted/renamed/created the page/component

Could also be useful

• [ ] w3c or other checker (https://github.com/silexlabs/Silex/issues/777)
• [x] on boarding messages
• [ ] new version available, need refresh

[lexoyo]

work in progess: https://github.com/silexlabs/grapesjs-notifications