feature request: Add text justification

[notgull]

I am currently developing a cosmic-text-based implementation of the piet text API, see here. The only bits from piet that are currently unimplemented are variable font sizes (already raised in #64) and text justification.

piet expects there to be utilities for text justification, with start (default), right, center and justified alignments. See this enum for more information.

Are there any plans to add text alignment to cosmic-text?

[grovesNL]

On the iced Discord (under discussions/Advanced Text Handling) we briefly discussed adding justification and alignment to cosmic-text's Attrs.

It's possible to work around it after layout has already happened by shifting glyphs around in the final layout line (I use this technique for centering text currently), but obviously that's not ideal.

[notgull]

Closed by #78

[jackpot51]

I think the system @hojjatabdollahi designed that each buffer line has alignment works best. It matches what was done for wrapping, since we cannot do spans of test inside a paragraph with different alignment as far as I know.

[jackpot51]

If there are concerns with that implementation, please open another issue.