The PYTHONPATH environment variable sometimes causes issues,
clearing it in the helper batch files is easier than talking
every user individually though the process of removing it
to see if it resolves the issue they are having.
To make triaging a little easier these batchfiles generate the
debug log and sysinfo files and instruct the user how to attach
them to their bug report
Differential Revision: https://developer.blender.org/D4505
Reviewers: brecht, zeddb