Break input handler dep on Terminal.scroll

src/Types.d.ts

@@ -23,7 +23,6 @@ export type LineData = CharData[];
 export interface IInputHandlingTerminal {
   viewport: IViewport;
 
-  scroll(eraseAttr: IAttributeData, isWrapped?: boolean): void;
   is(term: string): boolean;
   resize(x: number, y: number): void;
 }
@@ -41,6 +40,7 @@ export interface ICompositionHelper {
  */
 export interface IInputHandler {
   onTitleChange: IEvent<string>;
+  onScrollRequest: IEvent<IAttributeData, boolean | void>;
 
   parse(data: string | Uint8Array): void;
   print(data: Uint32Array, start: number, end: number): void;