* Fix some input issues on non-Windows systems
Disable the main menu bar when the 3D view is active.
Disable mouse input processing and "exclusive mouse input" until each editing dialog closes.
* Enable front/backgroup in LinedefEditForm{,UDMF} in the Setup method
The Setup method is called to specify which linedefs are being edited by the LinedefEditForm, and set up the dialog appropriately, so the front/backgroup should be enabled in the Setup method, at the same time the front/backside check boxes are checked or unchecked.
Remove thread priority settings (this is not the right way to do it)
Stop brain dead busy looping and use Monitor.Wait + Monitor.Pulse
Only call Control.Invoke if its a worker thread calling RunOnUIThread
Add the code for running multiple background threads (unfortunately blocked by DevIL apparently not being thread safe, gg!)
Changed the way editor is closed during the update process (updater now asks to close the editor after downloading the update package).
Added write access check before performing the update.
The editor can now update the updater.
Updater: merged relevant parts of SharpCompress into the updater source, reducing updater file size from 900 kb to 150 kb.
Updated ZDoom_DECORATE.cfg.
Added, Things mode: added "Show Light Radii" and "Show Sound Radii" main toolbar and View menu buttons.
Fixed, Action arguments control: invisible splitter between args1-3 and args4-5 is no longer draggable.
Updated ZDoom ACC (SetTranslation).
Updated ZDoom_ACS.cfg (SetTranslation).
Probably fixed probable I/O race condition when loading images.
Fixed Visual mode stuttering due to floating point precision degradation when running the editor for several days without restarting (internal timer is now reset when saving the map or creating a new one).
Fixed, Nodes Viewer, cosmetic: Nodes Viewer window position was reset after pressing the "Rebuild Nodes" button.
Added Eternity Game configurations by printz.
Updated ZDoom_ACS.cfg (CheckClass).
Updated ZDoom ACC (CheckClass).
Added "doomthingrotationangles" Game Configuration property. When enabled, editor actions related to changing thing angle will snap the resulting angle to 45 degree increments. This property is set to true for vanilla game configurations.
Fixed a crash when changing game configuration from one without Thing actions support to one with them while in Things mode.
Fixed, cosmetic, DB2 bug: current editing mode button was deselected after reloading resources.
Updated documentation ("Game Configuration - Basic Settings" page).
