PlasmaZones 1.6.0

Added

• Multi-zone snapping support in window tracking

Fixed

• Shader parameters from previously-used shaders accumulating in layout JSON
• Atomic undo for shader switching (single undo step instead of two)
• Post-install messages now note that KWin restart is required to load the effect

Removed

• Dead properties: Layout::author, Layout::shortcut, Zone::shortcut (never wired up)
• Dead files: ZoneEditor.qml, LayoutPicker.qml, ShaderOverlay.qml, shadercompiler.cpp, zonedataprovider.cpp