Cosmetic changes in Sector Info Panel and Thing Browser Control.
ArgumentInfo: fixed a crash when enum specified in a game configuration doesn't exist.
Updated Hexen and ZDoom linedef configs.
Updated ZDoom_DECORATE.cfg
Thing Edit form: when selection contains more than one thing, thing types form selected category are now randomly applied to it.
Fixed, Thing Edit form: selection change was not processed in some cases.
Changed, Thing Edit form: multi-select mode is now disabled when only one thing is edited.
Internal: different implementation of MultiSelectTreeview (http://sourceforge.net/projects/mstreeview/) is now used.
Game Configurations: changed default map name for Doom maps to "E1M1".
New Map Form: "E1M1" is now used as a default name for Doom maps.
Thing Browser Control: double-click event is now sent only if user clicked in the node's label area.
Interface: added info messages for several toolbar toggles.
Interface: made Brightness icon more readable when using dark windows themes.
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.
