Debugging Process Start/External Processes

Use gflags.exe

• part of windows sdk WindowsSDK\Debuggers\x64\gflags.exe
• helpful for debugging things like UBT which are kicked off as child processes or GUIless stuff like server processes
  
• Reference from https://udn.unrealengine.com/questions/225812/debugging-ue4editor-cmdexe.html
• Also, the check our internal kldevtils python cli toolset which contains these types of helpers