support multithread debugging

[WebFreak001]

[WebFreak001]

Moved to when vscode actually supports multithreaded debugging

[outcoldman]

@WebFreak001 this is how Microsoft C++/C debugger implements it

So I guess it is supported by VSCode, just in weird way.

[zcnet4]

MI2DebugSession constructor parameter threadID is passed by vscode?

class MI2DebugSession extends vscode_debugadapter_1.DebugSession {
constructor(debuggerLinesStartAt1, isServer = false, threadID = 1) {
super(debuggerLinesStartAt1, isServer);
this.variableHandles = new vscode_debugadapter_1.Handles();
this.threadID = 1;
this.threadID = threadID;
}

[zcnet4]

https://github.com/Microsoft/vscode-debugadapter-node/blob/master/adapter/src/debugSession.ts

I look at debugSession.ts code and found that threadID is not vscode passed. When the debugging is interrupted, you can use the info thread command to get the number of threads