StemRoller: desktop stem separator, Android stems player, and server daemons

- stemroller/: PySide6/QML desktop app and player for separating music into stems
- android/: Plex music player that plays per-stem mixes, with Android Auto support,
  a graphic + parametric (Equalizer APO-style) EQ, and offline downloads
- server/: stemserve (serves stems to the app) and stemd (separates the library on
  the server's GPU, with "Stem Now" priority requests)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

stemroller/qml/StemRoller/qmldir

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+module StemRoller
+singleton Theme 1.0 Theme.qml
+AeroButton 1.0 AeroButton.qml
+AeroComboBox 1.0 AeroComboBox.qml
+AeroSlider 1.0 AeroSlider.qml
+AeroSwitch 1.0 AeroSwitch.qml
+CaptionButton 1.0 CaptionButton.qml
+Card 1.0 Card.qml
+DashedFrame 1.0 DashedFrame.qml
+DropZone 1.0 DropZone.qml
+Elevation 1.0 Elevation.qml
+FrameOverlay 1.0 FrameOverlay.qml
+GlassPanel 1.0 GlassPanel.qml
+Glow 1.0 Glow.qml
+IconButton 1.0 IconButton.qml
+Icon 1.0 Icon.qml
+LevelMeter 1.0 LevelMeter.qml
+QueueItem 1.0 QueueItem.qml
+ResizeEdge 1.0 ResizeEdge.qml
+SettingsDialog 1.0 SettingsDialog.qml
+Sidebar 1.0 Sidebar.qml
+StatusChip 1.0 StatusChip.qml
+StemLane 1.0 StemLane.qml
+StripedProgress 1.0 StripedProgress.qml
+Tip 1.0 Tip.qml
+TitleBar 1.0 TitleBar.qml
+Toast 1.0 Toast.qml
+TrackView 1.0 TrackView.qml
+Transport 1.0 Transport.qml
+Txt 1.0 Txt.qml