Option to only include filename instead of filepath in $print emit

[blackshibe]

Current emit:
[The/Industrial/Revolution/and/its/consequences/have/been/a/disaster/for/the/human/race.tsx:21]: Hello world

Proposed emit:
[race.tsx:21]: Hello world

The point is to make resulting print statements shorter. I find myself labelling .lua files with the latter method sometimes, and pretty much all the time in C++/Rust.