Small yet nice widget to add - pen palette

[sand1024]

I've created a small yet nice widget for a bit more convenient way for working with pens.

It allows managing of persistent pens, select entities based by pens and apply pens to selection, current layer and so on.

Demo video for the widget is there - https://youtu.be/YSU0K3-PfbI Feature branch - https://github.com/sand1024/LibreCAD/tree/pens_palette_widget Readme - https://github.com/sand1024/LibreCAD/blob/pens_palette_widget/PEN_PALETTE_README.md

If it is better to create a merge request rather than issue there - please let me know.

[dongxuli-concord-design]

Can you send in a Pull Request?

[sand1024]

here it is - https://github.com/LibreCAD/LibreCAD/pull/1745

[dxli]

Merged