Dependency upgrades and animation frame bug fix.

This release contains a single bug fix for a requestAnimationFrame issue that can suddenly make the redraw loop look like it's not updating.

Also upgraded all the dependencies to remove npm vulnerabilities.

Stop propagation of a mouse-down event when a shape is selected.

Allows for HTML elements positioned on top of the mapd-draw canvas to be clickable.

Updated Cursor Handling

• Cursor icons now render with SVG for support in IE/Edge and Retina displays
• Cursor icons understand how to interact with DOM and canvas elements, and move off of the canvas
• Cursor icons will know to reset to defaults when a shape is deleted
• Full support for scatter plot and pointmap chart types

Initial release of mapd draw

Initial release of the mapd draw library. Contains 2 entry point engines, one for drawing shapes only, and the other ShapeBuilder which contains a UI for selecting and modifying shapes.