Add a "Sun" icon to switch to dark mode

Author: LittleJ

system/Debug/Toolbar/Views/toolbar.tpl.php

@@ -49,6 +49,7 @@
 <div id="debug-bar">
 	<div class="toolbar">
 		<span id="toolbar-position"><a href="javascript: void(0)">&#8597;</a></span>
+		<span id="toolbar-theme"><a href="javascript: void(0)">&#9728;</a></span>
 		<span class="ci-label">
 			<a href="javascript: void(0)" data-tab="ci-timeline">
 				<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAYAAADgdz34AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAD7SURBVEhLY6ArSEtLK09NTbWHcvGC9PR0BaDaQiAdUl9fzwQVxg+AFvwHamqHcnGCpKQkeaDa9yD1UD09UCn8AKaBWJySkmIApFehi0ONwwRQBceBLurAh4FqFoHUAtkrgPgREN+ByYEw1DhMANVEMIhAYQ5U1wtU/wmILwLZRlAp/IBYC8gGw88CaFj3A/FnIL4ETDXGUCnyANSC/UC6HIpnQMXAqQXIvo0khxNDjcMEQEmU9AzDuNI7Lgw1DhOAJIEuhQcRKMcC+e+QNHdDpcgD6BaAANSSQqBcENFlDi6AzQKqgkFlwWhxjVI8o2OgmkFaXI8CTMDAAAAxd1O4FzLMaAAAAABJRU5ErkJggg==">