For windows users that use MINGW the shell scripts as still useful
(preferable to the .bat scripts) but they don't support symlink.
Add a little script for managing these entry points.
This change was mostly mechanically created by running this script.
The non-py version of these scripts were converted to shell scripts
in #10729. The .bat files run python explicitly so can directly
reference .py versions of these scripts.
Also, move em-config to em-config.py to match all the others.
juj
Sam Clegg
Joshua Granick