InteractiveImage cleanup

• Merged the elementId and zone props of InteractiveImage into a element prop
• Removed the mainElement computed on InteractiveImage, made redundant by the element prop
• Added a polygonsEqual helper to prevent patching an element's polygon when it has not changed
• Removed an unnecessary <svg> in ImageLayer, made redundant by the one in InteractiveImage
• Renamed elementCoords to zoneBBox to make it clearer
• Removed default values on the scale and position props on ImageLayer as those were wrong and always overriden by InteractiveImage
• Removed MIN_IMAGE_HEIGHT from InteractiveImage and the minHeight prop on ImageLayer as it's just a constant
• Removed the useless imageCoords prop on ImageLayer
• Removed the useless zoneCoords computed on ImageLayer
• Removed the unnecessary image and corpusId computed properties on InteractiveImage
• Removed the unused :image on <Tools> in InteractiveImage
• Renamed position.updateView and rectify to recenter in ImageLayer to make them clearer
• Renamed ANNOTATION_MODES to ELEMENT_CREATION_MODES in InteractiveImage to make it clearer
• Removed the svgPoint data in InteractiveImage as it is just a local variable of getPosition
• Removed a use of a global event variable, deprecated in JavaScript, in mouseAction on InteractiveImage
• Removed unnecessary function arguments on translate and magnetize in InteractiveImage
• Removed the unnecessary and confusing cleanEdited method on InteractiveImage
• Ignored middle or right clicks entirely