v0.7.50

• Fixed -contours creating intersecting lines on certain inputs.
• The web UI now shows a raster's own pixels as squares once they are magnified to two screen pixels or more, instead of smoothing them into a blur.
• GeoJSON import uses about a quarter less memory.
• GeoParquet and FlatGeobuf export use much less memory and run faster, by skipping conversion to GeoJSON.
• GeoParquet row groups are now sized by their estimated size in bytes instead of by a fixed row count. Groups target 16MB of uncompressed data, so that a typical file is split into several groups that a reader can scan in parallel and skip past when filtering. Added -o rowgroup= to set the number of rows per row group explicitly.
• Improved CRS support for GeoParquet.