chore: offload user input to InputManager

src/shell/Shell.ts

@@ -7,7 +7,7 @@ export abstract class Shell {
     readonly abstract Version: string
     readonly abstract Name: string
     broadcaster: EventBroadcaster
-    terminal: Terminal
+    readonly terminal: Terminal
 
     constructor(broadcaster: EventBroadcaster, terminal: Terminal) {
         this.broadcaster = broadcaster
@@ -17,6 +17,5 @@ export abstract class Shell {
     abstract LoadProgram(program: Program, name: string): void
     abstract ExecuteProgram(name: string, args: string[]): void
     abstract Init(): Promise<void>
-    abstract HandleKeyInput(key: string, isCharacter: boolean): void
     abstract SetWorkingDirectory(directory: Item): Promise<void>
 }