Binding a null bean should clear the bound field values (#8288)

* Add clear field values #8287

Added functionality to make it possible to clear bound field values manually
or when setting a null bean to binder.

Binder will now clear bound fields for setBean(null) or if using readBean() functionality
when calling the clear() method. Binder.clear() will throw a IllegalStateException if
we have a bound bean.

* MultiSelectionModel MultiSelect should implement emptyValue

* Removing public clear() method and clearing field values only through
setBean(null) and readBean(null) to be consistent and not have
confusing functionality.

* Simplified clearFields() as we don't need to check if field is readOnly

* Document in removeBean JavaDoc that it will also clear the bound fields
if we have a bean the is removed.

* Binder should not have changes after clearing fields.

* Add getEmptyValue as default to MultiSelect.
Multiselect default for empty value should be an empty set.

* Revert "Add getEmptyValue as default to MultiSelect."

This reverts commit 45de8f45c4a1e3e45ab8a0353ab2a48bb4f1be6f.

* Merge branch 'master' into issue/8287_Clear_bound_fields

* Remove override for default implementation.

* Fire status change event on clearFields if we had changes before clearing.

* Formatting.

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