Visual mode: using "Select" action with "select with the same texture" modifier in some cases selected middle texture when it shouldn't have.

Error checks: added "Check unused textures" option.
Replaced MissingTexture3D and UnknownTexture3D.
Sectors mode: restored "Lower/Raise Floor/Ceiling by 8 mp" actions.
Visual mode: in some cases sidedefs were rendered as selected when they were not.
Existing linedefs were not split while drawing new lines in some cases.
Texture and height overrides were not applied correctly in some cases.
Preferences form: "Ctrl+Alt+ScrollUp" and "Ctrl+Alt+ScrollDown" dropdown items were setting the shortcut to "Ctrl+Shift+ScrollUp" and "Ctrl+Shift+ScrollDown".

Nodes Viewer: ZNODES were properly shown only on freshly opened maps.

Sector highlight is now shown in many more places.
Edit area auto-focusing is now disabled when any form is open.

Fixed a crash when enabling Nodes Viewer mode in an unsaved map.

Fixed: texture size label's visibility was inconsistent in ImageSelectorControls.

Program version, including revision number, is now updated and handled properly.

We should copy middle texture to upper/lower parts regardless of whether they are actually required when AutoClearSidedefTextures is disabled, I suppose (aaaaand there was a logic error there).

Reverted "Delete Item" action to the way it worked in DB2.
Added "Dissolve Item" action, which works the way "Delete Item" worked in previous revisions of GZDB.
Added "Auto Clear Sidedef Textures" action, "Edit" menu and toolbar button, which toggle automatic removal of sidedef textures when floor or ceiling height is changed or when geometry is drawn, copied or pasted.
Draw Settings panel: upper/lower texture overrides can now be used.
Draw Settings panel: added 2 sets of buttons, which allow to quickly set or clear textures in current selection.
Things are now rendered behind AND on top of the grid/linedefs/vertices when they are dragged.
Redesigned hints system. They are now shown in a side panel.
Edit area auto-focusing is now disabled when script editor is open.
Texture Browser form: no texture group was selected when opening the form in some cases.
Fixed several strange/misleading text messages.

Action descriptions: added "disregardalt" parameter.

Visual mode: added "Match Brightness" action.
DECORATE parser: actor names, which contain "+" and "-" symbols, are now parsed correctly.
Fixed an error in lump ranges creation logic.
Cosmetic fixes in various warning/error messages.
Updated documentation.

Added hints for Drag Geometry modes.

Classic modes: bilinear filtering was used in full brightness mode regardless of preferences setting.
Classic modes: "Paint Selection" and "Toggle Full Brightness" actions can now be used from any plugin.
Fixed possible crash in DECORATE actor color override logic.

Added info about DECORATE keys to documentation (Configurations -> DECORATE keys).

Fixed a bug in Line2D.GetIntersection(), introduced in r1854 (SHOULD... OPTIMIZE... MORE... CAREFULLY!!!11).
A couple of minor optimizations in Renderer3D.

Fixed a misleading hint.

Open Map Options and Map Options forms: resources can be added by dragging them on top of resources list.

UDMF map parser should work ~35% faster now.
Texture browser form: keyboard focus was not updated when switching between textures using Tab key.
"Graphics" folder is now checked when searching for texture patches.
Various cosmetic changes here and there.

Info panel was not updated after leaving Visual mode.
Moved hints logic to ClassicMode, so hints can be displayed by any plugin.
Visual mode: dynamic light animation was not working.
Minor performance improvements in Actor, Configuration, UDMF and TEXTURES parsers.

Increased performance when creating new map geometry (for example, when applying changes made by "Draw Line", "Draw Rectangle" etc. actions).

Sector and Thing Info panels: fixed possible crash when trying to show unknown thing/sector flag.
Hints were not shown properly when multiselection was started while highlighting a map element.
Copy/Paste actions work much faster now.
Classic modes: rendered grid size in now adjusted to current zoom level.

Increased performance when deleting things in Things mode, linedefs in Linedefs mode and sectors in Sectors mode.
Increased performance when canceling Edit mode after pasting.
"Export to Wavefront .obj" function: current selection is now converted to sectors before running the function (previously it would export selected sectors when there were sectors selected, or the whole map when no sectors were selected).

Things mode: selection info was not updated when selection was cleared.

Updated hint system.
Corrected 2 typos in action names.

Info panel: current mode name was shown when in shouldn't have been.

Sectors mode: optimized sector highlight rendering logic.
Sectors mode: optimized sector effect/tag labels update logic.
Geometry tools: optimized several core functions.
Hints for current editing mode can now be displayed when nothing is highlighted (currently the hints are shown only in Draw Geometry mode).  
GZDB is now build with LARGEADDRESSAWARE flag, which increases amount of RAM GZDB can use from 1.4 to 2.8 GB.

Linedef info panel, UDMF: activation flags were not shown in flags panel and were causing exception.
Linedef info panel, Hexen map format: activation is now shown.

Removed 15 Mb of unused files (3 DB2 splash screen sources).

These changes were made in previous commit. I just forgot to write info about them:
Classic modes: going to Draw modes when Edit button is pressed when nothing is highlighted can be disabled in Preferences -> Editing -> "Start drawing when Edit pressed over empty space in Classic modes".
Classic modes: removed Preferences -> Editing -> "Try to align horizontal tex. offset of dragged geometry", because it was more confusing than helpful...

Visual mode: changed "Move Texture Left/Right/Up/Down by 8" actions to "Move Texture Left/Right/Up/Down by cur. grid size"
Visual mode: holding Ctrl-Shift while dragging texture with the mouse will snap texture offsets to current grid size.
Classic modes: interiors of highlighted sectors are now highlighted when the action target of currently highlighted map element is sector.
Unhandeled exceptions infos are now written to the event log.

Angle control (the newer, photoshop-like one): left-clicking inside the control now clamps angle to 45-degree increments. Right-clicking inside the control sets precise angle.
Thing Edit Form: replaced angle control with newer one.
Classic modes: fixed minor rendering artifacts when drawing thing direction arrow.

Updated ACS and DECORATE script configurations.

Sectors mode: event lines were not rendered for things targeting highlighted sector.
Added "DropItem" and "CheckFlag" definitions to ACS and DECORATE script configurations.