Visplane Explorer Mode: fixed an issue that caused a crash when the map doesn't have nodes the Visplane Explorer Mode understands. Fixes #736

Visual Mode: fixed an issue where using the "apply camera rotation to things" action did not update the thing cages properly

Draw Settings docker: fixed an issue where toggling the texture check boxes stopped texture overrides from being applied

Map element associations: fixed a problem where things that have a argument of type tag set to 0 were referencing all things with tag 0. Fixes #718

Linedefs Mode: fixed a crash that could happen when the mouse was moved out of the map control while an UDBScript was modifying the map

Sectors Mode: fixed a crash that could happen when the mouse was moved out of the map control while an UDBScript was modifying the map

Edit Selection Mode: improved handling of texture transformation (still doesn't work 100% correctly)

Map Analysis Mode: fixed an issue where lines were erroneously reported as overlapping in certain situations. Fixes #713

Nodes Viewer Mode: the mode will not engage anymore if ZNODES are found, do to ZDBSP reordering the vertices when rebuilding the nodes. Addresses #659

Visual Mode: Fixed a problem where using visual sloping a slope handle around itself resulted in invalid slopes

UDBScript: added an option to open the selected folder in the Explorer to the context menu of folder items in the file tree

Copy and Paste Properties: fixed a problem where the "fadecolor" GZDoom UDMF sector property was not copied/pasted

Visual Mode: fixed a problem where offsetting the middle texture of double sided lines would not work under certain circumstances. Fixes #702

* Extended rendering options for drawing vertices
* Fixed vertex scale slider behaviour
* Force plot highlighted vertex in DragSectorsMode
* Moved ShouldRenderVertices property into the properties region
* made config file variable lower case to be in line with other config file variables

Visual Mode: added actions to lower and raise map elements by the current grid size (no defaults bound). Resolves #699

Snap selection to grid: fixed a problem that could cause a crash if geometry got removed by snapping it to the grid

Visual Mode: fixed a problem that resulted in incorrect texture offsets when moving a texture by grid size, and the grid was a multiple of the texture size

OBJ Exporter: fixed a problem where the model path controls were disabled unless creation of MODELDEF was enabled. Fixes #692

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