Add basic support for cursor blinking

src/renderer/Interfaces.ts

@@ -1,6 +1,8 @@
-import { ITerminal } from '../Interfaces';
+import { ITerminal, ITerminalOptions } from '../Interfaces';
 
 export interface IRenderLayer {
+  onOptionsChanged(options: ITerminal): void;
+
   /**
    * Resize the render layer.
    */
@@ -12,10 +14,16 @@ export interface IRenderLayer {
   reset(terminal: ITerminal): void;
 }
 
+/**
+ * A render layer that renders when there is a data change.
+ */
 export interface IDataRenderLayer extends IRenderLayer {
   render(terminal: ITerminal, startRow: number, endRow: number): void;
 }
 
+/**
+ * A render layer that renders when there is a selection change.
+ */
 export interface ISelectionRenderLayer extends IRenderLayer {
   render(terminal: ITerminal, start: [number, number], end: [number, number]): void;
 }