Set visibility for test methods
Add prefillValues functionality (allows to fill form fields` with predefined values)
prefillValues on form rendering
Add `prefilled` css class (streamline css classes too)
Replace prefillValues with _validateValues and _setValues

- extract prefillValues logic into _validateValues and _setValues
- remove automagic usage of prefillValues (used param `values`), manual setting instead
- adjust tests
Rollback deployVersion changes
Merge pull request #1267 from tomaszdurka/issue-1267

Introduce validateValues and setValues for Forms