simple implementation of zoom in / zoom out Fixes #1274

[bulbil]

#1274

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Additional Comments

• Adds zoom buttons to canvas panel instances using markup from no longer used zoom button lightbox ui logic
• Removes old reference to unused lightbox ui zoom buttons
• Adds event handlers on canvas panel set up
• Adds related styles to starter-default

thegetty/quire-starter-default#59

[geealbers]

Works for me! Thanks @bulbil