- Unused textures error checker doesn't erroneously report textures on 3D floors with the use upper/lower flags set (followup to #269)
@ Refactored texture error checks to reuse code

- Improved the wording for the "hidden" UDMF sector flag to make clear that it only hides the sector on the textured automap

- Added option to enable additive paint selecting without holding shift independently from regular additive selecting

- The missing textures checker now finds missing upper/lower textures on 3D floors when the appropriate flags of the Sector_Set3dFloor special are used. Fixes #269

- Textures will now wrap correctly in visual mode when the flag of the Line_SetIdentification special is set in Hexen format. Fixes #271

- Fixed a bug where the unknown texture error checker didn't report unknown textures on sidedefs that were never seen. Fixed #270

- Fixed a bug where textures for internal model skin names did not load when "Path" was specified in MODELDEF

- Fixed a problem where model textures were not loaded from the textures directory or from TEXTUREx definitions. Fixes #173 and #226

- Improved performance of the texture browser. This should significantly reduce the times it takes to open the texture browser when using large texture sets

- Fixed a bug where moving the mouse outside the window could crash when pasting a selection while having auto dragging enabled. Fixes #110.

- Fixed a freeze in the Tag Range plug-in when using the "relative" and "skip used tags" options. Fixes #125.

- Fixed an issue where the current editing mode was not re-initialized properly when opening a map from current WAD

- Test map from current mouse position now works properly in Hexen/UDMF maps with multiple player starts. Also works in maps without a valid player start now. Fixes #263.

- Improved support for auto aligning scaled textures

3D floors are now updated in real time in visual mode when their control sector is sloped through the line slope action. Fixes #250.

* Adding check for missing activations on lines that have an activation-requiring action

* Adding skip check if the map isn't UDMF

* Oops, typo in name of check

Added: string/float user variables, //$UserDefaultValue <value> for specifying default user variable value