Resprite: pixel art studio

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- Optimization: Display the theme list alphabetically
- Optimization: Add two preset themes
- Optimization: When moving selection, hold down shift to allow only horizontal or vertical movement
- Optimization: When using the move tool, hold down shift to allow only horizontal or vertical movement
- Optimization: When using the line tool, hold down shift to enable angle snapping
- Fixed: Some devices crash when opening the export dialog
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