New Features

• GdiImageLayerProxy class
• AsyncLayerProxyLayer class
• MiniMapControl (thanks @becio)
• Allow use of SharpSbn spatial index
• Add IMapTool interface to write custom tools for SharpMap.UI
• Add WPF Control wrapping MapBox (thanks @petlof)
• Allow setting zoom by scale (thanks @petlof)
• GeoPackage provider
• SharpDX layer
• Added ISession interface to configure GeometryFactory and Reprojection facilities.
• Graticule map decoration (thanks @terribletim)
• Add LayerListImageGenerator (thanks for fine-tuning @terribletim)

Improvements

• Update of GeoAPI to v1.7.5 and NetTopologySuite to v 1.15.x
• OracleSpatialProvider (thanks @petlof)
• WmsLayer (thanks @becio)
• Handling of FeatureTable, FeatureTableCollection, FeatureDataSet
• Updated GDAL/OGR to v2.4.2
• Moved BruTileLayer to seperate project, updated BruTile to v2.x
• KmlProvider (thanks @becio, @terribletim)
• Quick accurate label collision detection
• Make IProvider interface generic
• Added ToSource and ToTarget reprojection methods to Layer class
• Add LayerTitle property to ILayer interface
• Various improvements for SqlServer2008 and SqlServerSpatialObjects provider
  (thanks @joriswit, @petlof, @terribletim)
• ScaleBar adjustments for WebMercator (thanks @terribletim)
• MapTransform (thanks @terribletim)
• Refactor OleDb__Provider to Db__Provider (thanks @joriswit)
• Move map image generation for MapBox to LegacyMapImageGenerator,
  wrap functionality in IMapImageGenerator interface
• Handle sub-datasets in GdalRasterLayer

Various, numerous bug fixes

Thanks to all who have helped to make this possible, especially (in no specific order) @becio, @petlof, @joriswit, @terribletim