Avoid per-frame 'set' action handler in config.xml for blending day and night color

--HG--
branch : kaetemi-optimize

code/ryzom/client/data/gamedev/interfaces_v3/config.xml

@@ -2882,15 +2882,12 @@ This MUST follow the Enum MISSION_DESC::TIconId
             type="bool"
             value="true" />
   <!-- Blend between day and night (lightLevel = 0 day) (lightLevel = 1 night) -->
-  <link expr="depends(@UI:VARIABLES:CURRENT_TIME)"
-        action="set"
-        params="dblink=UI:SAVE:COLOR:R|value=ilinear(getLightLevel(), getRed(intToColor(@UI:SAVE:DAY_COLOR)), getRed(intToColor(@UI:SAVE:NIGHT_COLOR)))" />
-  <link expr="depends(@UI:VARIABLES:CURRENT_TIME)"
-        action="set"
-        params="dblink=UI:SAVE:COLOR:G|value=ilinear(getLightLevel(), getGreen(intToColor(@UI:SAVE:DAY_COLOR)), getGreen(intToColor(@UI:SAVE:NIGHT_COLOR)))" />
-  <link expr="depends(@UI:VARIABLES:CURRENT_TIME)"
-        action="set"
-        params="dblink=UI:SAVE:COLOR:B|value=ilinear(getLightLevel(), getBlue(intToColor(@UI:SAVE:DAY_COLOR)), getBlue(intToColor(@UI:SAVE:NIGHT_COLOR)))" />
+  <link expr="identity(ilinear(getLightLevel(), getRed(intToColor(@UI:SAVE:DAY_COLOR)), getRed(intToColor(@UI:SAVE:NIGHT_COLOR))), @UI:VARIABLES:CURRENT_TIME)"
+        target="@UI:SAVE:COLOR:R" />
+  <link expr="identity(ilinear(getLightLevel(), getGreen(intToColor(@UI:SAVE:DAY_COLOR)), getGreen(intToColor(@UI:SAVE:NIGHT_COLOR))), @UI:VARIABLES:CURRENT_TIME)"
+        target="@UI:SAVE:COLOR:G" />
+  <link expr="identity(ilinear(getLightLevel(), getBlue(intToColor(@UI:SAVE:DAY_COLOR)), getBlue(intToColor(@UI:SAVE:NIGHT_COLOR))), @UI:VARIABLES:CURRENT_TIME)"
+        target="@UI:SAVE:COLOR:B" />
   <!--<link expr="depends(@UI:VARIABLES:CURRENT_TIME)" action="set" 
                 params="dblink=UI:SAVE:COLOR:A|value=ilinear(getLightLevel(), @UI:SAVE:DAY_COLOR:A, @UI:SAVE:NIGHT_COLOR:A)" />-->
   <!-- The User Target Slot and UID -->