adding rounded bar support to circular progress

[MikeTeok]

Description

Adding rounded corner for circular progress bar

Usage

(circular-progress :class "ram-progress"
:thickness 10
:clockwise true
:rounded true
:value 50
:start-at 75
(label :halign "center" :text "RAM\n50%"))

Showcase

Checklist

Please make sure you can check all the boxes that apply to this PR.

• All widgets I've added are correctly documented.
• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing

[elkowar]

This looks great!
Could you rebase your changes, so I can merge this? ^^

[MikeTeok]

This looks great! Could you rebase your changes, so I can merge this? ^^

I have rebased, but I am not sure if I done it correctly, please check if its ok to merge now.