Move responsibility to decode output encoding to terminal implementation

js/dist/xterm.d.ts

@@ -1,11 +1,13 @@
 import * as bare from "xterm";
+import { lib } from "libapps";
 export declare class Xterm {
     elem: HTMLElement;
+    term: bare;
+    resizeListener: () => void;
+    decoder: lib.UTF8Decoder;
     message: HTMLElement;
     messageTimeout: number;
     messageTimer: number;
-    term: bare;
-    resizeListener: () => void;
     constructor(elem: HTMLElement);
     info(): {
         columns: number;