New features

Foreground (text & icons) customization
Apply fg color to Window Buttons widget
option to use a fixed custom panel side padding
Custom panel background color
Control real panel background opacity
Option to fully remove panel background
Add outline and shadow control
Force Kirigami.Icon color to specific plasmoids using isMask

Bug fixes

Listen for widgets added/removed from the panel
Don't change fg color in tray expanded representation
Reduce CPU usage only changing fg color for PlasmoidItem children
Fix notification applet appearing artifact
Don't change opacity when disabled
Continue after error caused by panel being edited

Other

Split configuration sections into tabs
Use color picker for color fields
Add mouse wheel area to floating text fields

⚠️ Plasma 5 version has been dropped, mainly due to limitations porting foreground colorization

Full Changelog: v0.2.0...v0.3.0