merge ParserTerminal with InputHandler

- quick'n dirty merge of classes - ParserTerminal is subclass of InputHandler
- basic fallback handlers implemented
- test regressions due to multiple changes in EscapeSequenceParser
- runtime down to 2.3s
- TODO: fix tests, implement DCS functions, full merge of classes

src/Terminal.ts

@@ -334,7 +334,7 @@ export class Terminal extends EventEmitter implements ITerminal, IDisposable, II
 
     this._inputHandler = new InputHandler(this);
     // this._parser = new Parser(this._inputHandler, this);
-    this._newParser = new ParserTerminal(this._inputHandler, this);
+    this._newParser = new ParserTerminal(this);
     // Reuse renderer if the Terminal is being recreated via a reset call.
     this.renderer = this.renderer || null;
     this.selectionManager = this.selectionManager || null;