0.14.2

The focus of this version is input data: widgets now have a Data associated type, passed by reference
to event handlers and to a new update method. The key advantages of this change are:

• Declarative specification of trees with changeable widgets. For example, before this change a counter must construct a label displaying the initial count and explicitly update this label when the count changes; now the displayed label is effectively a function of the count.
• As a direct result of the above, it is no longer necessary for parent nodes to refer to children by name, thus it is no longer necessary to use structs with named fields (at least in the common cases).
• "View widgets" are now much more tightly integrated with other widgets, making the SingleView widget redundant.

For more on input data, read the design document.

For the full list of changes, see the CHANGELOG.