Script Generator: Reduce Size

As a user of the script generator, I would like this application to be lightweight and portable so I can easily download or be sent the Script Generator application, in order to create scripts in preparation to my visit to ISIS.

Currently, the size of the script generator is >1GB, the vast majority of this (880mb) is the bundled IBEX python instance including all dependencies. It may be possible to remove this requirement by either simply allowing the scriptgen to use geniepython at its usual location, or configuring a venv in place of the full packaged python install.

What is the acceptance criteria?

Size of the Script generator application is reviewed and either:
Significantly reduce size of the Script Generator (if the amount of work needed is reasonable)
Create a spin out ticket to reduce the size of the Script Generator (if the amount of work needed exceeds the scope of this ticket)
Show/reason why a significant reduction in application size is not feasible

Extra Information

Muon group has assigned "crucial" priority to this issue.
Due to the open ended nature of the work, this may be suitable for timeboxing

How to Test

verbose instructions for reviewer to test changes
(Add before making a PR)