Massively improved Config Key/Joy Mappings screen.

Warning is dismissable now, and cursor does not start in a position that will change a setting.
New special actions added:  ClearToDefault, ReloadFromDisk, SaveToDisk, SetListMode.  Exit is a special action.
Player is prompted to save when exiting screen instead of saving after every action.
Special actions fallback on Graphics/SMC action if they don't have their own.
Moved SMC overlay to Graphics/SMC warning.
Metrics for configuring input lock time, warning autodismiss time, lines visible, and NoSetListPrompt autodismiss time.
Header row added for cursor to start on.
ScreenMapControllers2 deleted as obsolete.
BitmapText:maxwidth changed to factor the zoom of the actor into the calculation.

src/ActorUtil.cpp

@@ -221,7 +221,7 @@ Actor *ActorUtil::LoadFromNode( const XNode* _pNode, Actor *pParentActor )
 		// sClass is invalid
 		RString sError = ssprintf( "%s: invalid Class \"%s\"",
 			ActorUtil::GetWhere(&node).c_str(), sClass.c_str() );
-		Dialog::OK( sError );
+		LuaHelpers::ReportScriptError(sError);
 		return new Actor;	// Return a dummy object so that we don't crash in AutoActor later.
 	}