Drag to reorder/resize cameras in camera groups

[hawkeye217]

• Add ability to reposition and resize camera streams in a camera group on desktops/tablets
  • Cameras can be placed on a 12-column grid and resized based on aspect ratio
  • Default layout is the same as flexbox - a 3-camera, 16:9 aspect ratio grid
  • Phones will continue to use flexbox (grid/list selectable) for all camera groups
  • Default layout ("All cameras") will always use flexbox, no matter the device, still respecting config's order directive
• Layout saved to browser's indexed db, so this feature is per-device
• Enter/exit layout "edit mode" with a small semi-transparent button on the bottom right corner
• Implement "clear all layouts" button in General settings
• Prevent camera group name from being "default"
• Add deletion capabilities to usePersistence and usePersistedOverlayState hooks

Along with the addition of camera groups for 0.14, this PR closes #6531, #5424, #1735

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