Implement image comparison command

CHDataManagement/Page Elements/ContentElements/ImageCompare.swift

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+
+struct ImageCompare: HtmlProducer {
+
+    let left: ImageSet
+
+    let right: ImageSet
+
+    static let extraAttributes = " draggable='false''"
+
+    static var requiredIcon: PageIcon { .leftRightArrow }
+
+    func populate(_ result: inout String) {
+        result += "<div class='image-compare' style='aspect-ratio: 748/487'>"
+        result += "<div class='right'>\(left.content)</div>"
+        result += "<div class='left'>\(right.content)</div>"
+        result += "<div class='drag'>"
+        result += "<svg><use href='#\(Icon.LeftRightArrow.name)'></use></svg>"
+        result += "</div></div>" // Close drag, image-compare
+    }
+}