Summary:
Parts binding will follow a similar approach to regular property
binding:
`var error = factory.PartName().PropertyName().Bind(modelProperty);`
* Changed both `Bind()` overloads to return the error code from
`efl_ui_property_bind`
* Also properties from interfaces implemented didn't have their `Bindable`
wrapper methds available.
Depends on D9563
Reviewers: felipealmeida, cedric, SanghyeonLee, woohyun
Reviewed By: cedric
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D9564