add clickable list of APKs to the swap HTML index page

This allows for rapid, direct download of APKs.  It is sometimes useful, as
long as it doesn't get in the way.

app/src/full/java/org/fdroid/fdroid/localrepo/LocalRepoManager.java

@@ -147,10 +147,24 @@ public final class LocalRepoManager {
             BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
                     new FileOutputStream(indexHtml)));
 
+            StringBuilder builder = new StringBuilder();
+            for (App app : apps.values()) {
+                builder.append("<li><a href=\"/fdroid/repo/")
+                        .append(app.installedApk.apkName)
+                        .append("\"><img width=\"32\" height=\"32\" src=\"/fdroid/repo/icons/")
+                        .append(app.packageName)
+                        .append("_")
+                        .append(app.installedApk.versionCode)
+                        .append(".png\">")
+                        .append(app.name)
+                        .append("</a></li>\n");
+            }
+
             String line;
             while ((line = in.readLine()) != null) {
                 line = line.replaceAll("\\{\\{REPO_URL\\}\\}", repoAddress);
                 line = line.replaceAll("\\{\\{CLIENT_URL\\}\\}", fdroidClientURL);
+                line = line.replaceAll("\\{\\{APP_LIST\\}\\}", builder.toString());
                 out.write(line);
             }
             in.close();

app/src/main/assets/index.template.html

@@ -71,6 +71,28 @@
             color: #fff;
         }
 
+        details {
+            margin-left: 1em;
+        }
+
+        ul {
+            list-style-type: none;
+        }
+
+        ul > li {
+            padding: 1em 0;
+        }
+
+        ul > li a {
+            font-size: xx-large;
+            text-decoration: none;
+            color: #fff;
+        }
+
+        ul > li a img {
+            padding-right: 0.5em;
+        }
+
         #download-from-web {
             padding-left: 2em;
             padding-right: 2em;
@@ -105,5 +127,12 @@
             <img src="swap-tick-not-done.png" class="tick not-done" alt="Not done" />
         </li>
     </ol>
+    <br/><br/><br/><br/>
+    <details>
+      <summary>Available Apps</summary>
+      <ul>
+        {{APP_LIST}}
+      </ul>
+    </details>
 </body>
 </html>