Sectors Mode: fixed a bug that could cause a crash when drag-selecting over areas that contained sectors after deleting those sectors

Files specific to UDB are now used in the program configuration folder. The files are now called UDBuilder.cfg, UDBuilder.log, and UDBCrash.txt. If there's no UDBuilder.cfg it first tries to copy GZBuilder.cfg before creating a new configuration file. Resolves #442

Fix directory separators to not use Path.DirectorySeparatorChar as a forward slash is used on Linux/Unix, so it ended up preventing DECORATE and ZSCRIPT code from being loaded on Linux.

Path.DirectorySeparatorChar is a forward slash on Linux/Unix, so it ended up preventing DECORATE and ZSCRIPT code from being loaded on Linux.

Added fallback for event line labels to use the default window font is the one specified for labels couldn't be loaded

Fit Textures: entering floating point numbers in the texture repeat boxes is now less infuriating. Resolves #404.

Improved associations and event lines. Refactorings to make the whole thing more sensible (hopefully). Options to display labels on event lines (can be configured in Preferences -> Editing).

Image Exporter: fixed a bug where it always applied the floor offset, even when exporting the ceiling textures

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