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

Eternity Engine game configuration: removed the lightfloorabsolute and lightceilingabsolute fields from the sector flags, so that they are handled correctly. Fixes #670

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

* Updated the bundled Zandronum ACC with Zan 3.1 changes

* Add Zandronum 3.1 functions and constants to its ACS configuration

* Updated the Zandronum ACC (again), as it was missing GAMESTATE definitions

When choosing a difficulty or engine in the test toolbar button the engine will not be launched immediately. This can be reverted in the preferences. Resolves #626

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

IPK3 and IPK7 with an IWADINFO lump with a single IWAD definition are now recognized as the main resource file (used for the -iwad parameter when testing). Fixes #653

Hexen Game Configuration: fixed a problem where the default arguments of the Death Wyvern had special names, even though they actually don't do anything in game. Also renamed the thing from "Dragon Lich" to the correct "Death Wyvern". Fixes #660

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

ZScript: user variables of parent actors were not displayed in the custom tab of the thing editing dialog. Fixes #649

Fixed a problem where DeHackEd lumps failed to parse when their header wasn't at the beginning of the file. Fixes #647

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/

ZScript parser: fixed a bug where trying to parse the undocumented alternative array declaration syntax failed. Fixes #645

Fixed an issue where thing positions were modified even when the new position was the same as the old one. Fixes #644

ZScript parser: fixed a bug where included files where parsed when the #include directive was encountered, and not after the rest of the file was parsed. Fixes #641

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

Script editor: added support for the //$Skip editor in scripts. Adding this line will not add the next script to the drop down list of available scripts for the ACS actions in the thing and linedef editor dialogs. Resolves #636

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