Add unpackplugin command

Needed for the translators edition

core/language/en-GB/Help/unpackplugin.tid

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+title: $:/language/Help/unpackplugin
+description: Unpack the payload tiddlers from a plugin
+
+Extract the payload tiddlers from a plugin, creating them as ordinary tiddlers:
+
+```
+--unpackplugin <title>
+```

core/modules/commands/unpackplugin.js

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+/*\
+title: $:/core/modules/commands/unpackplugin.js
+type: application/javascript
+module-type: command
+
+Command to extract the shadow tiddlers from within a plugin
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.info = {
+	name: "unpackplugin",
+	synchronous: true
+};
+
+var Command = function(params,commander,callback) {
+	this.params = params;
+	this.commander = commander;
+	this.callback = callback;
+};
+
+Command.prototype.execute = function() {
+	if(this.params.length < 1) {
+		return "Missing plugin name";
+	}
+	var self = this,
+		title = this.params[0],
+		pluginData = this.commander.wiki.getTiddlerData(title);
+	if(!pluginData) {
+		return "Plugin '" + title + "' not found";
+	}
+	$tw.utils.each(pluginData.tiddlers,function(tiddler) {
+		self.commander.wiki.addTiddler(new $tw.Tiddler(tiddler));
+	});
+	return null;
+};
+
+exports.Command = Command;
+
+})();

editions/tw5.com/tiddlers/commands/UnpackPluginsCommand.tid

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+created: 20141029114305697
+modified: 20141029114305697
+tags: Commands
+title: UnpackPluginsCommand
+type: text/vnd.tiddlywiki
+caption: output
+
+{{$:/language/Help/unpackplugins}}