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

Negative vertical patch offsets are now handled correctly based on the game configuration. Fixes #561

TEXTURES lump: fixed a problem where textures that use textures as patches were too bright when gamma correction was enabled

Fixed a problem where linedefs were not split correctly under certain conditions when drawing or moving lines

Fixed a problem where sprites with 16 rotations defined in the TEXTURES lump would not be handled correctly (they are still not displayed with 16 rotations, but don't throw an error anymore)

Don't use thread unsafe collections in threaded code (hopefully fixes crash in Sectors Mode when selecting sectors)

3D Floor Mode: only 3D floors with the "user_managed_3d_floor" field set to true will be modified in UDMF maps

Resetting a slope in Sector Edit Form UDMF or with the Reset Slope action will not set the height to the z position at the center of the sector anymore, but to its original height

Increased performance on multi-core CPUs when selecting sectors in Sectors Mode when Synchronize Thing Editing is enabled

Added some sanity checks for maximum number of entries in the VERTEXES/SIDEDEFS/LINEDEFS/THINGS lumps for the binary map formats

Fixed a problem where saving a map would hang when the nodesbuilder produced too much output on stdout and strerr. Fixes #417. Fixes #498

Added fixes for the stuck thing checker for the Eternity Engine configuration (thanks for hawkwind3). Fixes #551

Map Analysis Mode: fixed a problem where checking for stuck things works incorrectly in some situations (thanks to hawkwind3). Fixes #469

Sector Edit Form UDMF: fixed a bug where resetting a slope when the sectors doesn't have a slope resulted in a nonsensical sector height

https://doomwiki.org/wiki/Static_limits

The VPO limit is raised by Hexen (160) & Strife (200)
so make it configurable in the basegame.

The hover tooltip will reflect the adjusted max
limit and the heatmap is interpolated to 0-255
for the 256x10 visplane_pal.png colour range
gradient.

Boom's linedef special 260 allows a 64K
translucency lump to be applied to the
front sidedef's midtex for applying a
custom 1 to 99% translucency value. Stop
reporting this as an unknown texture.

https://doomwiki.org/wiki/Vertical_offsets_are_ignored_in_texture_patches

BIGDOOR7 & STEP2 in doom.wad and doom2.wad contain
negative Y-offsets some a patch but instead the
renderer defaults to Y-offset value of 0.

This stops UDB's 3D visual mode from using the
negative value - change it to 0 to match the game
renderer. (G)ZDoom behaves the same as vanilla.

Stop calling ScriptFileDocumentTab.RemoveTrailingWhitespace()
on a text editor that has unchanged text. This causes the
currently-opened map to be marked 'isChanged == true' when
nothing is modified.

Program preferences are now saved as soon as the configuration dialog is closed
Recent files are now saved as soon as an existing map is loaded

Sector/Linedef/Thing/Vertex Edit Form: the map will not be marked as changed anymore when canceling changes made in the forms, when the map wasn't marked as changed before
Copying map elements doesn't mark the map as changed anymore if the map wasn't marked as changed before copying

Curve Linedefs Mode: fixed a problem where the curve would not flip when being dragged with the mouse

OBJ Exporter: unchecking the "Generate ZScript/DECORATE" and/or "Generate MODELDEF" checkboxes will now really not generate the respective files

Updated ZDaemon ACS configuration (thanks to DoomKrawa)

Several new ZDaemon ACS function added (thanks to DoomKrawa).