add support for CursorEntered and CursorLeft events in Windows OS #147
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A simple change that uses TrackMouseEvent to determine if the cursor has left the window. Uses WM_MOUSEMOVE to determine if the mouse has entered back into the window. Adds additional state
mouse_in_window
to theWindowState
struct to determine if the cursor is over the window. This is initialized to true since TrackMouseEvent will immediately register a WM_MOUSELEAVE message if the cursor is not in the window.Mostly adding this since it's useful for me so it may be useful for others.