feat: Add an iCON P1-M script variant

[bjoluc]

Hi folks,

here's how to test this:

• Download this zip file and extract icon_p1-m.js from it.
• Follow the setup instructions but using the icon_p1-m.js file you extracted (it's not released yet, hence not uploaded as a release asset).
• Read the P1-M section in the Supplementary Remarks for Individual Scripts section for details about the script and how to use it.

If anything isn't working or could be improved (except the known limitations), feel free to leave your feedback here. Thanks!