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.
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.
Location and active tab of all Edit Forms are now stored while GZDB is running.
Focus management between editing window and the rest of the interface should work better now.
Tag Explorer plugin: editing window was not updated properly when Edit forms were opened from Tag Explorer.
Tag Explorer plugin, UDMF: comment editing was incorrectly initialized in some cases.
Snap Map Elements to Grid mode now works much faster and shows a message when completed.
Forced default textures are now only used in drawing modes.
Exception Dialog: long error descriptions were breaking window layout.
Map will no longer be shown in Open Map form if unrelated data is encountered inside of map namespace.
Textures were not loaded properly from PK3/PK7 archives.
Visual mode: restored ability to remove textures using Delete action.
Visual mode: fixed several bugs in Cut/Copy/Paste things actions.
Visual mode: vavoom style 3d floors were not displayed properly.
Visual mode, 3d floors: added support for "RestrictLighting" (2) flag.
Visual mode, 3d floors: inner sides of 3d floors with "swimmable"/"render inside" flags used incorrect brightness value.
Texture scale controls now have "Link" button.
Thing, Sector (UDMF) and Linedef edit forms now work in realtime mode.
Some more fixes in Edit form realtime update stuff.
Removed some unused variables and functions.
Fixed incorrect behavior when 2 linedefs are merged into one after deleting a vertex, when a newly created linedef overlaps existing geometry.
Visual Vertex handles were not updated when sector's floor or ceiling height was changed.
