message: On replay don't initialise dbghelp at startup, instead init on demand
diff: @@ -1076,6 +1076,9 @@ namespace Callstack
  {
  void Init()
  {
  + // if we're capturing, need to initialise immediately to claim ownership and be ready to collect
  + // callstacks. On replay we can do this later when needed.
  + if(!RenderDoc::Inst().IsReplayApp())
  ::InitDbgHelp();
  }
  @@ -1097,6 +1100,9 @@ StackResolver *MakeResolver(byte *moduleDB, size_t DBSize, RENDERDOC_ProgressCal
  return NULL;
  }
  + // initialise dbghelp if we haven't already
  + ::InitDbgHelp();
  +
  return new Win32CallstackResolver(moduleDB, DBSize, progress);
  }
  