Refactor form container

[juzna]

Refactored Nette\Forms\FormContainer::getValues and ::setValues to use recursion instead of ugly recursive iterators. This code is much more straightforward in what it should do plus it allows extension (see below). Plus, all tests pass on it (so it shouldn't break anything)

See discussion on http://forum.nette.org/cs/6964-prilisna-slozitost-formcontainer-setvalues-getvalues

It also allows possible extension on your specific named containers: you can implement a class extending FormContainer and by overriding setValue + getValue methods, you can do absolutely whatever you want (like creating dynamic number of elements etc.) Serialization and deserialization is completely in your hands. This also goes very well with https://github.com/Foowie/DynamicFormContainer addon which when impelemting setValue + getValue can work much better than it's working now (pull request for that addon will be provided soon)

[juzna]

As I proposed before: Patch for DynamicFormContainer which makes its default values working can be very easy now: juzna/DynamicFormContainer@6cccc2d Take this as one example of possible extension to forms which will be available now.

[dg]

Merged