fix run.cmd script (#1633)

Restore ability to run run.cmd from directories other than the runner root, and fix it exiting the cmd that's running it.  Fixes #1632

Author: jeremyd2019

src/Misc/layoutroot/run.cmd

@@ -19,13 +19,13 @@ rem Run.
 rem ********************************************************************************
 
 :launch_helper
-copy run-helper.cmd.template run-helper.cmd /Y
+copy "%~dp0run-helper.cmd.template" "%~dp0run-helper.cmd" /Y
 call "%~dp0run-helper.cmd" %*
 
 if %ERRORLEVEL% EQU 1 (
   echo "Restarting runner..."
   goto :launch_helper
 ) else (  
   echo "Exiting runner..."
-  exit 0
+  exit /b 0
 )