Refactor boot sequence

This is the start of making it possible to use TiddlyWiki5 as a library
from a node.js application

boot/boot.js

@@ -1374,19 +1374,26 @@ $tw.boot.startup = function() {
 	});
 };
 
-/////////////////////////// Decrypt tiddlers and then startup
+/////////////////////////// Main boot function to decrypt tiddlers and then startup
+
+$tw.boot.boot = function() {
+	// Initialise crypto object
+	$tw.crypto = new $tw.utils.Crypto();
+	// Initialise password prompter
+	if($tw.browser) {
+		$tw.passwordPrompt = new $tw.utils.PasswordPrompt();
+	}
+	// Preload any encrypted tiddlers
+	$tw.boot.decryptEncryptedTiddlers(function() {
+		// Startup
+		$tw.boot.startup();
+	});
+};
+
+/////////////////////////// Autoboot in the browser
 
-// Initialise crypto object
-$tw.crypto = new $tw.utils.Crypto();
-// Initialise password prompter
 if($tw.browser) {
-	$tw.passwordPrompt = new $tw.utils.PasswordPrompt();
+	$tw.boot.boot();
 }
-// Preload any encrypted tiddlers
-$tw.boot.decryptEncryptedTiddlers(function() {
-	// Startup
-	$tw.boot.startup();
-});
-
 
 })();

tiddlywiki.js

@@ -5,3 +5,6 @@ This is invoked as a shell script by NPM when the `tiddlywiki` command is typed
 */
 
 var tiddlywiki = require("./boot/boot.js");
+
+// Boot the TW5 app
+$tw.boot.boot();