Updated tstl to latest version and improved error handling

Author: Perryvw

assets/layout/play.html

@@ -25,7 +25,7 @@
             </div>
             <div id="editor-output-terminal">
                 <div id="editor-output-terminal-header">
-                    TypescriptToLua version 0.18.0
+                    TypescriptToLua version 0.23.0
                 </div>
                 <div id="editor-output-terminal-content">
                 </div>