All the pieces so far:
- Dynamic tilemap.
- A minimap view synced to it (using 1px tile atlas for colors).
- Draggable viewport.
- Some animated sprites in world-space.
- Screen-space (yellow) and tile-space (blue) selection boxes.
- Status frames for sprites caught in selection.
- The window is still resizable (tilemap re-center appropriately and minimap sticks to its corner with a small padding).
