Brush properties - Added default values
Brush properties - Removed option to always auto-expand groups
Layer properties - Remember expanded/collapsed groups
Storage - Added migration system
Storage - Added migration that removes profiles made in the old layer properties format
Layer timeline - Added back zoom functionality
Core - For now, set default log level to debug
ColorGradient- Improved GetColor performance
ColorGradient - GetColor now handles colors not between two stops properly
Home - Fix links
Plugins - Only allow layer property registration through Brushes
Color brush - Default to solid color