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David Thompson authored
+ Refactor item-based attribute classes. Move most of the code in ComponentItem, ResourceItem, ComponentItemDefinition, and ResourceItemDefinition into two new base classes LinkItem and LinkItemDefinition. These classes handle links between an attribute and any resource or component of a resource. Note that smtk::attribute::RefItem should disappear in favor of a ComponentItem whose `acceptableEntries()` filter forces an attribute of the proper type. + Fix build when `SMTK_ENABLE_EXAMPLES` is on. + Prototype for a qtComponentItem.
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