Customizable formatting in UI persistence

[mkrecek234]

Idea:

• Not always is the Atk4/Data field content identical to its representation that we want to have.
• Example: you store a float value 8378583.783745 in the database - in tables or other UI elements, like text or messages, you want to define the format. E.g., 8,378,583.78 or 8378584.
• Solution: Approach to be able to add a UI characteristic to a model-specific field that defines the format.

Which fields types?
float, integer, date, datetime, time, boolean.

Challenge:
If you edit that field, you sure don't want it to be displayed in the format.

Suggestion:
I would fancy to at least be able to define it in the model init function, as to be passed on to UI. Otherwise it is double-work in your view elements. Such as $this->addField('amount' => ['type' => 'integer', 'ui' => ['format' => ['decimals' => 1, 'thousand_separator' => ',', 'prefix' => 'Hello', 'suffix' => ' kilograms']]);

related to #1126 and atk4/data#577

[mvorisek]

implemented in #1981