The rendering logic library.
| callbacks | This is the Callbacks mechanism for each Widget, providing a way to perform a function when
an action is intercepted (ie. mouse enter, exit, move, etc.)
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| engine | This is the Engine that is used to dispatch events from the screen to a corresponding list
of Widgets in a Window. This is the main event loop.
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| widget | This is the Widget and BaseWidget definitions for Widget objects to be defined by the
pushrod project, and other crates that may define or create their own Widgets.
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| widget_cache | This is the caching object that stores a list of Widgets that the Pushrod engine manages.
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| widget_config | This is a configuration object that stores information about Widgets.
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