Eternity Engine game configuration: fixed a problem where the 3DMidTex flag was not correctly pasted in Doom format. Fixes #606

Stair Sector Builder Mode: current settings can be now be saved as a default prefab that will always be loaded when using the Stair Sector Builder Mode

Classic modes: fixed a problem where "test from cursor position" wasn't working correctly when there was no player 1 start in the map and the last edited thing had its argument 0 set. Fixes #603

Visual Mode: fixed a problem where highlighted visual slope handles were not highlighted anymore after clearing the selection

3D Floor Mode: fixed a problem where 3D floor indicators on linedefs were still shown after removing all 3D floors from a sector

Eternity Engine game configurations: added support for arbitrary map names in the default testing parameters

Boom game configuration: fixed a problem where linedef actions 264 and 265 were not labeled correctly

Added safeguard so that the program doesn't crash when encountering an unknown header while unpacking zip files. It will add an error to the log instead

Effect browser form: fixed a bug where effects consisting of multiple bits were not selected correctly. Fixes #589

Visual Mode: fixed a bug where auto-aligning textures wouldn't work correctly in game configurations without support for local sidedef texture offsets, when short texture names were used, but the texture's source was a full texture name (i.e. from the /textures directory)

OBJ model loader: fixed sanity checks for faces that reference non-existing vertices, texture coordinates, or normals

MODELDEF: Fixed a crash when a FrameIndex tried to reference a model index that wasn't defined. Fixes #578

Fixed a crash when undoing after using the "test from current position" action when no player 1 start is in the map. Fixes #573

Stair Sector Builder Mode: fixed a crash when trying to build geometry from linedefs without sidedefs. Fixes #569

Linedefs Mode: fixed a problem where flipping a highlighted linedef would also select the linedef. Fixes #571

Map options: removed checkbox for opening resources as read-only. Resources are now always opened as read-only. Fixes #559

Open WAD dialog: don't filter for lowercase *.wad exclusively on non-Windows platforms. Resolves #567

Game configuration dialog: don't filter for only .exe and .bat when selecting a test program on non-Windows platforms. Resolves #566