Refactoring of Attribute Images, fix more or less decent slideshow. Turns out a few lines of css can get us there!

Logic/Web/ImageAttributionSource.ts

@@ -0,0 +1,29 @@
+import {UIEventSource} from "../UIEventSource";
+import {LicenseInfo} from "./Wikimedia";
+import BaseUIElement from "../../UI/BaseUIElement";
+
+
+export default abstract class ImageAttributionSource {
+
+
+    private _cache = new Map<string, UIEventSource<LicenseInfo>>()
+
+    GetAttributionFor(url: string): UIEventSource<LicenseInfo> {
+        const cached = this._cache.get(url);
+        if (cached !== undefined) {
+            return cached;
+        }
+        const src = this.DownloadAttribution(url)
+        this._cache.set(url, src)
+        return src;
+    }
+
+
+    
+    public abstract SourceIcon(backlinkSource?: string) : BaseUIElement;
+    protected abstract DownloadAttribution(url: string): UIEventSource<LicenseInfo>;
+    public PrepareUrl(value: string): string{
+        return value;
+    }
+
+}