Improve ZPL mark sense

[Cellivar]

Older ZPL printers have a more awkward way to detect the print mode apparently.

This also adds a "query printer status" button to the advanced and editor demos so you can see why your printer is blinking at you.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	61.7%	2887 / 4679
🔵	Statements	61.7%	2887 / 4679
🔵	Functions	48.85%	192 / 393
🔵	Branches	75.39%	527 / 699

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
src/Documents/ConfigDocument.ts	23.6%	75%	27.27%	23.6%	18-19, 31-35, 42-43, 46-48, 67-71, 74-76, 79-104, 109-110, 113-114, 117-124, 127-131, 134-141, 144-151, 154-165, 168-179, 182-195, 310-319
src/Languages/Zpl/CmdHostConfig.ts	95.63%	92.62%	83.33%	95.63%	55-56, 59-61, 66-67, 231-233, 377-378

Generated in workflow #167 for commit 8f94a9a by the Vitest Coverage Report Action