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This is the bulk of the work for introducing the central logical unit for managing and sychronizing focus as a first-class Blockly concept with that of DOM focus. There's a lot to do yet, including: - Ensuring clicks within Blockly's scope correctly sync back to focus changes. - Adding support for, and testing, cases when focus is lost from all registered trees. - Testing nested tree propagation. - Testing the traverser utility class. - Adding implementations for IFocusableTree and IFocusableNode throughout Blockly.