Feat: add MFM crop content
Created by: ikiko
Added MFM function to crop content (emoji and text). With this, we should be able to compose more interesting shapes.
Usage:
$[crop.right=50 💙]$[crop.left=50 💖]
Notes:
- very happy for any kind of feedback here or directly on Calckey.
- tested in browser only, which worked, but I'm unsure about the interplay with other styling options.