GZDoom game configuration: added support for distinct upper/middle/lower sidedef brightness levels. Resolves #694

UDBScript: fixed a bug where changing a thing's or linedef's arguments did not recorded for the undo system

UDBScript: fixed a problem where getting a highlighted map element would not work correctly in some circumstances

Visual Mode: added toggleable option to select all adjacent visual vertex slope handle when selecting a visual slope vertex handle. The action is called "Toggle Adjacent Visual Vertex Slope Selection"

UDBScript: the progress bar in the running script dialog now stops its animation when no progress was set and the script finished.

UDBScript: fixed a problem where the UDB.log() method crashed when a non-string object was passed to it

UDBScript: groups all classes, objects, and methods in a new UDB namespace, usable with the new feature version 4. Updated the documentation accordingly. Resolves #679

Added classic rendering mode to closer emulate software renderer visuals in visual mode

Added "Orbit" and "Move Camera to Cursor" visual mode actions (not bound by default)

Script run by UDBScript are now executed asynchronously

UDBScript: fixed a bug where Map.nearestLinedef, Map.nearestThing, Map.nearestVertex, and Map.nearestSidedef would not return valid objects when no nearest map element was found

Event lines are now shown between things and map elements even if the thing doesn't have an action, but directly uses its args. Resolves #676

UDBScript: Exported the classes Linedef, Sector, Sidedef, Thing, and Vertex, so that they can be used with instanceof
UDBScript: Map class: the getSidedefsFromSelectedLinedefs() method now correctly only returns the Sidedefs of selected Linedefs in visual mode (and not also the highlighted one)
UDBScript: Map class: added a new getSidedefsFromSelectedOrHighlightedLinedefs() method as the equivalent to the other getSelectedOrHighlighted*() methods
UDBScript: Sector class: added new floorSelected, ceilingSelected, floorHighlighted, and ceilingHighlighted properties. Those are mostly useful in visual mode, since they always return true when the Sector is selected or highlighted in the classic modes. The properties are read-only
UDBScript: Sidedef class: added new upperSelected, middleSelected, lowerSelected, upperHighlighted, middleHighlighted, and lowerHighlighted properties. Those are mostly useful in visual mode, since they always return true when the parent Linedef is selected or highlighted in the classic modes. The properties are read-only
UDBScript: added new example to apply textures for floor/ceiling and upper/middle/lower texture for selected map elements
UDBScript: updated documentation

Improved associations between arbitrary UDMF fields (used by the Eternity Engine game configuration)

Find and Replace Mode: fixed a problem where linedef activation flags could not be found or replaced. Fixes #667

UDBScript: fixed a problem where a version warning was shown then the script version was not equal to the UDBScript version (instead of only showing the warning when the script version was higher)

UDBScript: the methods of the Pen class now return the instance of the Pen class to allow method chaining. Resolves #662

UDBScript: fixed a problem where using QueryOption resulted in an exception being thrown. Fixes #661

Drag Geometry Mode: floor and ceiling panning are now correctly preserved when dragging geometry. Fixes 648

Added map scripting capabilities to UDB (#656). Documentation at https://biwa.github.io/udbscript-docs/

Visual Mode: fixed a bug where textures on 3D floors were not scaled correctly when using the upper/lower texture 3D floor flags. Fixes #640

Image Exporter: added option to chose between taking sector colors into account or not when exporting. Resolves #635

Image Exporter: fixed a bug where texture scales were not taken into account when exporting. Fixes #634

Visplane Explorer: fixed a bug where changing the settings after re-entering the mode would result in a crash. Fixes #624

Eternity Engine game configuration: it's again possible to set the floor and ceiling brightness independently from the sector brightness

Game configurations: added option to enable/disable GZDoom style distinct brightness for walls/ceilings/floors. Fixes #618

Visual Mode: added some safeguards against potential crashes that should never happen. Potentially fixes #614

Sectors Mode, Linedefs Mode, 3D Floor Mode, Grid Setup: fixed a problem where textures were not shown in Windows's high contrast mode. Fixes #612