Figure out if we can fix the Windows .bat behavior of exiting

[wolfv]

On Windows, users have to manually add a line like if errorlevel 1 exit 1 after every line of code.

I am wondering if there is a way to make this the default behavior of cmd.exe, or if we should add this line automatically in every line that doesn't end with the continuation character ^.

[wolfv]

Long term we definitely want to move away from .bat files anyways ...