debugger: add list of thread ids to TRK session state object

src/shared/trk/trkutils.h

@@ -107,7 +107,8 @@ struct Library
     uint dataseg;
 };
 
-struct TrkAppVersion {
+struct TrkAppVersion
+{
     TrkAppVersion();
     void reset();    
 
@@ -141,6 +142,10 @@ struct Session
     typedef QList<Library> Libraries;
     Libraries libraries;
 
+    typedef uint Thread;
+    typedef QList<Thread> Threads;
+    Threads threads;
+
     // Gdb request
     uint currentThread;
     QStringList modules;