Allow simple links (shown as fields) to be input in the creation screen

[openlowcode]

The creation screen should allow to enter on the creation screen itself the links that display as fields, as they are simple.

It should be compatible with improvement #242.

To perform that, the following is required:

• PREPARE CREATE ACTION - likely to add an empty array as input for the text field (or to allow it with null input value). In the end, not needed, widget will be modified by Allow ObjectArrayField to have no input data #259 to allow null attribute
• CREATE PAGE: get at once all the values selected in the array field (as they are stored locally). This is possible with SObjectArrayField widget.
• CREATE ACTION: creating the links after the creation of the object. Note: control for business rules will be performed to ensure that a bad link is not created by mistake.