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

UDBScript: fixed a problem in the voodoo doll example script when the "looping" option was set to true

ZScript: fixed an issue where #include files were not parsed when the parent file had a //$GZDB_Skip comment. Fixes #716

Added command palette that allows the user to search for (and execute) commands at any time. Unbound by default. Resolves #555

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)

- The updater can now update itself

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

UDMF: fixed an issue where user variables with default values were not saved when their value was equal to the type's default value. Fixes #709

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

MBF21 Game Configuration: Added missing "friendly" flag to things (thanks to hawkwind3). Resolves #703
MBF21 Game Configuration is now enabled by default

Fixed a problem where the display was desaturated in certain situations in classic modes when wireframe rendering was enabled when exiting Visual Mode. Fixes #619
Fixed a problem where sectors were not desaturated correctly in classic modes on map load

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