Features
- Initial implementation of multi-source tile source (#764)
- Added pixelmap annotation element (#767, #776)
Improvements
- Add more opacity support for image overlays (#761)
- Make annotation schema more uniform (#763)
- Improve TileSource class repr (#765)
- Improve frame slider response with base quads (#771)
- Default to nearest-neighbor scaling in lossless image conversion (#772)
- Improve the import time (#775, #777)
Bug Fixes
- The tile iterator could return excess tiles with overlap (#773)