* lineWidth is not supported in modern browsers
* allow marker shape selection in plot inspector
add shapes for canvas2d - point, cross, star
* change line style to line method in anticipation of adding true line style attribute
* add canvas2d circle marker shape
* allow point shapes for webGL plots
add circle shape
* refactor for clarity
* refactor shape to shape code
* add missing semi-colon
* helper function for marker options display in inspector
refactor for clarity
* access correct file
* add diamond marker shape
* add triangle shape to canvas
* add webgl draw triangle marker shape
* refactor fragment shader for clarity
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