User interface

Added an editor for environments (HDRI+ambient lighting+directional light) used in the 3D preview and paint panel
Updated the Library panel to be able to create, load, edit custom libraries, hide and find node categories and define aliases for nodes. Nodes are now sorted by usage in the nodes menu
In mesh painting tool, added procedural and mask layer types
New quick export option in 2D preview
Many improvements in 3D preview: sun shadow, anisotropic filtering, improved parallax mapping, improved tesselated models, supersampling, debanding (contributed by Hugo Locurcio)
Added configurable model rotation speed in the 3D preview (contributed by Jesse Dubay)
Added a maximum FPS setting for focused and unfocused modes (contributed by Hugo Locurcio and Jesse Dubay)
Added more overlay styles to the 2D preview
Added a Ctrl+Space shortcut and menu entry to toggle side docks' visibility (contributed by Hugo Locurcio)
Added shortcuts to deselect all nodes and invert the current selection (contributed by Hugo Locurcio)
Added shortcuts to navigate between tabs (contributed by Hugo Locurcio)

Engine

Added named parameters to Remote node, that can be used in all float parameter expressions in all nodes of the subgroup
Parameters in Remote nodes can be renamed and reordered
Increased maximum exportsize to 8192x8192 (contributed by Hugo Locurcio)

Added a mode for square UVs in the Fill to UV node (contributed by Kasper Arnklit Frandsen)
Added a Tones range node (contributed by Kasper Arnklit Frandsen)
Added Smooth curvature nodes (contributed by Kasper Arnklit Frandsen)
Added a new FBM node with simplex noise (contributed by Kasper Arnklit Frandsen)
Added a new Fast blur node
Added a new Edge detect node
Added more generation options to the Debug node
Updated Occlusion node (contributed by Kasper Arnklit Frandsen)
Added a new anisotropic noise node (contributed by Kasper Arnklit Frandsen)
Added random color output to color tiler node (contributed by Kasper Arnklit Frandsen)
Added stitches controls to weave node (contributed by Kasper Arnklit Frandsen)
Added new Advanced Tiler node