Improve offline saving with TiddlyWeb

Now the usual “save changes” button in the sidebar will save an offline
copy of the wiki that excludes the TiddlyWeb plugin. Previously, this
functionality was only available in the control panel, leading to
several problems such as that discussed here:

https://groups.google.com/d/topic/tiddlywikidev/U61pO-TR854/discussion

plugins/tiddlywiki/tiddlyweb/ServerControlPanel.tid

@@ -18,9 +18,3 @@ Host configuration: <$edit-text tiddler="$:/config/tiddlyweb/host" tag="input" d
 ----
 
 <$button message="tw-server-refresh" class="btn btn-warning">Refresh</$button> to fetch changes from the server immediately
-
-----
-
-Download an offline copy of this wiki:
-
-{{$:/editions/server/download-offline-button}}

plugins/tiddlywiki/tiddlyweb/download-offline-button.tid

@@ -1,3 +0,0 @@
-title: $:/editions/server/download-offline-button
-
-<$button message="tw-download-file" param="$:/editions/server/download-offline" class="btn-big-green">Download Offline Snapshot {{$:/core/images/save-button}}</$button>

plugins/tiddlywiki/tiddlyweb/save-all.tid

@@ -1,4 +1,4 @@
-title: $:/editions/server/download-offline
+title: $:/core/save/all
 
 \define saveTiddlerFilter()
 [is[tiddler]] -[[$:/boot/boot.css]] -[[$:/HistoryList]] -[type[application/javascript]library[yes]] -[[$:/boot/boot.js]] -[[$:/boot/bootprefix.js]] -[[$:/plugins/tiddlywiki/filesystem]] -[[$:/plugins/tiddlywiki/tiddlyweb]] +[sort[title]]