Feature request: add `-0` option to output files terminated by a null character

[snowman]

Description

Currently, the output of sxiv is not terminated by null

Expected

The -0 option corresponds to the -print0 option of find

By using -0 option, sxiv output files using NUL as delimiter instead of newline

$ find . -type f -name "*.png" -print0 | xargs -0 sxiv -0 -io | xargs -0 rm -vf

[PRESFIL]

Duplicate of: #445