Support selection

src/renderer/Interfaces.ts

@@ -2,5 +2,12 @@ import { ITerminal } from '../Interfaces';
 
 export interface IRenderLayer {
   resize(terminal: ITerminal, canvasWidth: number, canvasHeight: number, charSizeChanged: boolean): void;
+}
+
+export interface IDataRenderLayer extends IRenderLayer {
   render(terminal: ITerminal, startRow: number, endRow: number): void;
 }
+
+export interface ISelectionRenderLayer extends IRenderLayer {
+  render(terminal: ITerminal, start: [number, number], end: [number, number]): void;
+}