ngx-schema-forms v2.0.0-beta.4

New features:

• Ajv schema validator.
• Angular forms compatible: Property tree is created using FormGroup, FormArray and FormControl classes.
• Array now properly loads initial data from model.
• WidgetTyep: WidgetRegistry now supports WidgetType, now working WidgetType.Field and WidgetType.Fieldset.
• Fieldset widgets: Now we create widgets for the fieldset. Rightn now only Fieldset (default) and Tabs are available.
• No widget: If widget id is set to 'none', control will be generated but no widget will be created.
• FormProperty now has access to widget instance, ObjectProperty also has access to fieldset widget instance.

TODO:

• fix 2 way data binding not working when model is updated programatically.
• for schema changes (template schema ngIf), use json-patch to update controls tree without rebuilding.
• tests, lots of them.
• add animation for control tree update
• expose widget from template schema fields, fieldsets and buttons
• default widgets initial invalid messages show only after submit (configurable)
• refactor default widgets to be components, and create widgets abstract types for basic for default widgets;