SCRIPT EDITOR: Add column number tracker

[branchtheory]

Preflight Checklist

• I have read the "Reporting Bugs / Requesting Features" section in the Contributing Guidelines.
• I understand that the issue tracker is for bugs in the game itself and feature requests, not for issues with my own scripts.

Description

A column number ticker / tracker would help with debugging. Had an error last night where the fault was on column 105, for example. I've taken to finding the column by copying and pasting the offending lines into Notepad and using the column tracker there.