mvvmfx/src/main/java/de/saxsys/mvvmfx/utils/mapping/ModelWrapper.java
public StringProperty field(StringGetter<M> getter, StringSetter<M> setter) {
		return add(new BeanPropertyField<>(this::propertyWasChanged, getter, setter, SimpleStringProperty::new));
	}
public StringProperty field(StringGetter<M> getter, StringSetter<M> setter) {
		return add(new BeanPropertyField<>(this::propertyWasChanged, getter, setter, SimpleStringProperty::new));
	}
Add a new field of type String to this instance of the wrapper. This method is used for model elements that are
following the normal Java-Beans-standard i.e. the model fields are only available via getter and setter methods
and not as JavaFX Properties.

<p>

Example:
<p>

<pre>
ModelWrapper{@code<Person>} personWrapper = new ModelWrapper{@code<>}();

StringProperty wrappedNameProperty = personWrapper.field(person -> person.getName(), (person, value)
-> person.setName(value));

// or with a method reference
StringProperty wrappedNameProperty = personWrapper.field(Person::getName, Person::setName);

</pre>


@param getter
a function that returns the current value of the field for a given model element. Typically you will
use a method reference to the getter method of the model element.
@param setter
a function that sets the given value to the given model element. Typically you will use a method
reference to the setter method of the model element.

@return The wrapped property instance.