- Better handling of missing UDMF TEXTMAP fields (Error now includes the element and index at which the field is missing and will not abort loading. Instead it will use a default value.)
- UDMF TEXTMAP now contains the indices of elements as comment next to the structure header.
- Thing cages in Visual Mode now also get the selection and highlight color so that a selection and highlight on things without sprite can also be seen.

Added default thing flag "dm" (1024) to game configurations so that things appear in deathmatch by default

- Progressive undo/redo system (much faster and up to 1000 undo/redo levels) Please note that several plugin functions and properties have changed.
- Some small optimizations in the classic 2D rendering (cached linedef flags, reduced some unneeded redrawing)

- Fixed a bug that allowed to use texture names longer than 8 characters, making the WAD file unusable after saving
@ added a texturenamelength config var. Setting it to higher than 8 may result in unexpected behaviour due to the speed optimizations relying on 8 char texture names and should not be changed for now.

@ added internal option to prevent automatic removal of unreferenced elements when other elements are removed

@ Added Create* functions in the MapSet that allows specifying the index (element at existing index will move to the end of the array instead of the newly created element).

@ Changed the MapSet to work with arrays instead of linkedlists. Because the index is now know for each element and can be retrieved in O(1) efficiency it has become a property (Index) for all map elements. GetIndexFor* functions have been removed. Get*ByIndex are now also of O(1) efficiency.

@ white texture has been moved to the DataManager and is now also available to plugins

Replacing can now be made undone

- Fixed some minor bugs in the choice of default drawing textures

Added variable "skyflatname" as a game configuration item. It is used to ignore false positives when checking for missing textures. Updated all the game config files to make use of this feature.

Fixed bug that caused some items in the script editor autocomplete list not to select when the first few characters were typed.

Fixed crash when Select Texture or Select Flat is clicked in Grid Setup dialog and no texture was previously used

- Added HighlightedObject property to the EditMode class, the object returned depends on the editing mode and the current highlight
- Exposed several properties in the ClassicMode class

Made the BindMethods and UnbindMethods functions in the ActionManager public so they can be used in plugins