Migrate Clipboard handler to TypeScript

Also apply JavaScript rules in `.editorconfig` in TypeScript files as well.

Part of #335

src/Interfaces.ts

@@ -2,12 +2,26 @@
  * @license MIT
  */
 
+export interface IBrowser {
+  isNode: boolean;
+  userAgent: string;
+  platform: string;
+  isFirefox: boolean;
+  isMSIE: boolean;
+  isMac: boolean;
+  isIpad: boolean;
+  isIphone: boolean;
+  isMSWindows: boolean;
+}
+
 export interface ITerminal {
   element: HTMLElement;
   rowContainer: HTMLElement;
+  textarea: HTMLTextAreaElement;
   ydisp: number;
   lines: string[];
   rows: number;
+  browser: IBrowser;
 
   /**
    * Emit the 'data' event and populate the given data.
@@ -16,4 +30,5 @@ export interface ITerminal {
   handler(data: string);
   on(event: string, callback: () => void);
   scrollDisp(disp: number, suppressScrollEvent: boolean);
+  cancel(ev: Event, force?: boolean);
 }