Rebuild form configuration and new options

Problem/Motivation

• Several problems have been detected when saving and rendering the form.
• Missing required options, like hide the submit/reset button on different regions.
• Missing js and template to make Exposed Form Region standalone

After this contribution, we hope that the form works as it should.

Steps to reproduce

• Create view and add some exposed filters
• Change exposed form type to Exposed Form Region
• Configure regions as you want
• Change some filter identifier and try to relocate form elements to some region.
• Also, you can try to remove some form element from some region, it won't work, it only saves if new element is added, not removed.
• This also affects the rendering of the form, it doesn't remove the form element with different filter identifier, so the form element will be quadriplicated (as 4 regions)

Proposed resolution

Fix some issues from code. The form and rendering was using $filter->field instead instead of $filter->identifier.

In addition to fixing these issues, we have implemented new options to exposed form region configuration
We rebuild the form configuration in 4 details (1 per each region) that contains these new options:

• Layout of view sections
• Hide submit button
• Hide reset button
• Enable autosubmit
• Include region form elements in the global form submit