Dehacked: Dehacked files are now properly loaded from directories

Game configurations: added option to enable/disable GZDoom style distinct brightness for walls/ceilings/floors. Fixes #618

Visual Mode: added some safeguards against potential crashes that should never happen. Potentially fixes #614

Sectors Mode, Linedefs Mode, 3D Floor Mode, Grid Setup: fixed a problem where textures were not shown in Windows's high contrast mode. Fixes #612

Fixed a problem where generalized effects could output a warning if they are made up of multiple bits (like in the MBF21 generalized sector effects)

Texture Browser: fixed a problem where cycling through the width and height jumped to 196 instead of 192. Fixes #613

Eternity Engine game configuration: fixed a problem where the Friendly and Dormant flags were not correctly pasted in Doom format.

Eternity Engine game configuration: fixed a problem where the 3DMidTex flag was not correctly pasted in Doom format. Fixes #606

Stair Sector Builder Mode: current settings can be now be saved as a default prefab that will always be loaded when using the Stair Sector Builder Mode

Classic modes: fixed a problem where "test from cursor position" wasn't working correctly when there was no player 1 start in the map and the last edited thing had its argument 0 set. Fixes #603

Visual Mode: fixed a problem where highlighted visual slope handles were not highlighted anymore after clearing the selection

3D Floor Mode: fixed a problem where 3D floor indicators on linedefs were still shown after removing all 3D floors from a sector

Eternity Engine game configurations: added support for arbitrary map names in the default testing parameters

Boom game configuration: fixed a problem where linedef actions 264 and 265 were not labeled correctly

Added safeguard so that the program doesn't crash when encountering an unknown header while unpacking zip files. It will add an error to the log instead

Effect browser form: fixed a bug where effects consisting of multiple bits were not selected correctly. Fixes #589

Visual Mode: fixed a bug where auto-aligning textures wouldn't work correctly in game configurations without support for local sidedef texture offsets, when short texture names were used, but the texture's source was a full texture name (i.e. from the /textures directory)