Byzi - Tk [busy] command implementation

Found on GitHub at https://github.com/aryler/Byzi/.

Version 0.2, Spring 2017.

The Byzi extension for Tk provides a simple means to
block keyboard, button and pointer events from Tk widgets, while
overriding the widget's cursor with a configurable busy cursor.

The Byzi extension is based on the Tk 8.6 [busy] command sources.
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See also: [busy] [tk busy] [tkbusy]

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