[feature/attach-dl] Downloading all attachments fully implemented

Added a function to list all available archiving methods and integrated
it with the prosilver style.

Heavy modifications to download/file.php to support archiving and
downloading of multiple files at once.

PHPBB3-11042

phpBB/styles/prosilver/template/viewtopic_body.html

@@ -46,7 +46,14 @@
 	<!-- ENDIF -->
 
 	<!-- IF S_HAS_ATTACHMENTS -->
-		<span>[ <a href="{U_DL_ALL_LINK}">{L_DOWNLOAD_ALL_ATTACH}</a> ]</span>
+		<div class="dl_links">
+			<strong>{L_DOWNLOAD_ALL_ATTACH}:</strong>
+			<ul>
+			<!-- BEGIN dl_method -->
+				<li>[ <a href="{dl_method.LINK}">{dl_method.TYPE}</a> ]</li>
+			<!-- END dl_method -->
+			</ul>
+		</div>
 	<!-- ENDIF -->
 
 	<!-- IF .pagination or TOTAL_POSTS -->
@@ -161,7 +168,19 @@
 
 			<!-- IF postrow.S_HAS_ATTACHMENTS -->
 				<dl class="attachbox">
-					<dt>{L_ATTACHMENTS}<!-- IF postrow.S_MULTIPLE_ATTACH --> [ <a href="{postrow.U_DL_ALL_LINK}">{L_DOWNLOAD_ALL}</a> ]<!-- ENDIF --></dt>
+					<dt>
+						{L_ATTACHMENTS}
+						<!-- IF postrow.S_MULTIPLE_ATTACH -->
+							<div class="dl_links">
+								<strong>{L_DOWNLOAD_ALL}:</strong>
+								<ul>
+								<!-- BEGIN dl_method -->
+									<li>[ <a href="{postrow.dl_method.LINK}">{postrow.dl_method.TYPE}</a> ]</li>
+								<!-- END dl_method -->
+								</ul>
+							</div>
+						<!-- ENDIF -->
+					</dt>
 					<!-- BEGIN attachment -->
 						<dd>{postrow.attachment.DISPLAY_ATTACHMENT}</dd>
 					<!-- END attachment -->

phpBB/styles/prosilver/theme/content.css

@@ -702,3 +702,26 @@ dl.pmlist dd {
 	margin-left: 61% !important;
 	margin-bottom: 2px;
 }
+
+.topic-actions div.dl_links {
+	padding: 10px 0 0 10px;
+}
+
+div.dl_links {
+	display: inline-block;
+	text-transform: none;
+}
+
+.dl_links strong {
+	font-weight: bold;
+}
+
+.dl_links ul {
+	list-style-type: none;
+	margin: 0;
+	display: inline-block;
+}
+
+.dl_links li {
+	display: inline-block;
+}