Color Picker: fixed a bug that prevented all intensity and interval sliders to show up for flicker lights

OBJ Exporter: replaced default folder selection dialog with something more convenient (and more consistent with the rest of the program)

Fix exception caused by horizontal mouse wheel (resolves #409 reported by ioan-chera, reported by KanaiZo)

OBJ Exporter: checking the "Solid" checkbox now adds to following flags to the actor: INVULNERABLE, NODAMAGE, SHOOTABLE, NOTAUTOAIMED, NEVERTARGET, DONTTHRUST

Add support for Line_SetAutomap{Flags,Style}

OBJ Exporter: improved exporting models for use in GZDoom. It can now export models that can be directly used in GZDoom, and also creates the necessary MODELDEF and ZScript/DECORATE code

Image exporter: added options to use sector brightness for the export, create brightmaps (based on sector brightness), and split the image into 64x64 tiles

Sectors Mode: the sectors things are in are only determined if necessary, which should increase performance when switching into Sectors Mode in very big maps

3D Floor Mode: fixed a crash when duplicating 3D floor geometry and there was not enough space in the control sector area

Fixed a bug introduced by addressing #427 that stopped the script editor to show up in vanilla Hexen. Fixes #429.

Fixed a problem where translucent 3D floors were drawn solid. The cause was a rounding error because of the transition from float to double.

The script editor is now only shown if the current game configuration supports scripts. Resolves #427.

Fixed a crash in the DIALOG/SCRIPTS editor when selecting any other than the first two options in the "look in" combo box in the replace tab. Fixes #425.

Draw Ellipse Mode: fixed a rounding error that could result in wrong shapes under certain conditions

Edit Selection Mode, Flat Align Mode: fixed a bug where snapping occurred to wrong positions on lines when the grid was transformed

Draw Rectangle Mode: fixed a problem where the guidelines were not displayed correctly under certain conditions

Things Mode: performing the smart grid transform action will now set the grid origin to the selected or highlighted thing
Sectors Mode: performing the smart grid transform action will now reset the grid transform

Vertices Mode: the preview vertex is now correctly shown on intersections between the closest line and the transformed grid

Added some error handling to duplicating 3D floors