view_form: Simplify things by removing property_add.
view_form example: Simpler approach.
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Remove unused file.
view_form: Fix property set
view_form: This version is cleaner than the previous one and the example now add a label and an entry.

Using int type as widget verifier in elm_view_form;
Code cleanup;
Added widget_get to get widget's value from given property name;
Added translator from widget's class name to its local identifier.