fix: no such file or directory, mkdir 'C:\BuildAgent\****\tmp\C:'

[bobbyg603]

Description

The : was gunking things up. Adds filenamify which removes non-allowed Windows path characters.

Fixes #113

Checklist

• [x] Tested manually
• [x] Unit tests pass with no errors or warnings
• [x] Documentation updated (if applicable)
• [x] Reviewed by at least 1 other contributor