DisplayConstraints
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small sensor to set a display to fixed bounds
example .display is included


todo:
    * support most display constraints
      e.g. anchors, styles, bg-color,
           window-flags, etc
    
    * make percent mode for width and height work

changelog:

0.1.0:
    initial release
    fixate the width and height of a display in
    pixels or percents
    