feat: add panel header icon

[agaertner]

Adding a minor optional title icon to panel as it has been often suggested in the Discord.
I've actually done this through reflection in Proof Logix because I didn't want to copy the entire class.
https://github.com/agaertner/bhm-proof-logix/blob/main/src/Core/UI/FlowPanelWithIcon.cs

Usage example:

Example:

Is this a breaking change?

No

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[dlamkins]

I'm willing to accept this as a feature. Could you take a look at the spacing used in the Characters module, though? It seems a bit tighter there and I think I prefer it.

[agaertner]

I'm willing to accept this as a feature. Could you take a look at the spacing used in the Characters module, though? It seems a bit tighter there and I think I prefer it.

It looks 2 pixel closer to the left edge. I will move it.

EDIT: I adjusted it to match the padding in your example (source).

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud]

Quality Gate failed

Failed conditions
6.3% Duplication on New Code (required ≤ 6%)

See analysis details on SonarCloud