send InitializedEvent in launchRequest

If we don't do this, the VS Code doesn't know our debugger is ready
to use and it causes unexpected behavior.

This fixes pause not working after restart.

Author: dlech

src/debugServer.ts

@@ -1,4 +1,4 @@
-import { DebugSession, Event, TerminatedEvent, Thread, ThreadEvent, StoppedEvent, ContinuedEvent } from 'vscode-debugadapter';
+import { DebugSession, Event, TerminatedEvent, Thread, ThreadEvent, StoppedEvent, ContinuedEvent, InitializedEvent } from 'vscode-debugadapter';
 import { DebugProtocol } from 'vscode-debugprotocol';
 
 /**
@@ -27,6 +27,7 @@ export class Ev3devBrowserDebugSession extends DebugSession {
     protected launchRequest(response: DebugProtocol.LaunchResponse, args: LaunchRequestArguments): void {
         this.sendEvent(new Event('ev3devBrowser.debugger.launch', args));
         this.sendResponse(response);
+        this.sendEvent(new InitializedEvent());
     }
 
     protected customRequest(command: string, response: DebugProtocol.Response, args: any): void {