ValueHolder documentation

# ValueHolder

ValueHolder inherits from Model and defines the instance variable value. It has a subclass: ScrollValueHolder.

ValueHolders hold a single value, and trigger a #value update when the value is set.
The #value update may be overridden by sending #setValue: instead of #value.

## Methods defined in ValueHolder:

### Methods for accessing:

- setValue: newValue
  Set without triggering an update.
- value
- value: newValue

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