[HTML5] Better editor HTML, small refactor.

Side and GDNative libraries are now added by engine.js , the dynlink pre
js had been deleted.

misc/dist/html/editor.html

@@ -4,7 +4,7 @@
 	<meta charset='utf-8' />
 	<meta name='viewport' content='width=device-width, user-scalable=no' />
 	<link id='-gd-engine-icon' rel='icon' type='image/png' href='favicon.png' />
-	<title></title>
+	<title>Godot Engine Web Editor ($GODOT_VERSION)</title>
 	<style type='text/css'>
 
 		*:focus {
@@ -189,8 +189,17 @@
 				<br />
 				<img src="logo.svg" width="1024" height="414" style="width: auto; height: auto; max-width: 85%; max-height: 250px" />
 				<br />
+				$GODOT_VERSION
+				<br />
+				<a href="releases/">Need an old version?</a>
+				<br />
+				<br />
+				<br />
 				<label for="zip-file" style="margin-right: 1rem">Preload project ZIP:</label> <input id="zip-file" type="file" id="files" name="files" style="margin-bottom: 1rem"/>
 				<br />
+<a href="demo.zip">(Try this for example)</a>
+				<br />
+				<br />
 				<button id="startButton" class="btn" style="margin-bottom: 4rem">Start Godot editor</button>
 				<br />
 				<button class="btn" onclick="clearPersistence()">Clear persistent data</button>