Added xml UI for the avfilter.colorize

data/effects/avfilter/avfilter_colorize.xml

+<!DOCTYPE kpartgui>
+<effect tag="avfilter.colorize" id="avfilter.colorize">
+	<name>Color Overlay</name>
+	<description>Overlay a solid color on the video stream with mixing feature.</description>
+	<author>libavfilter</author>
+	<parameter type="animated" name="av.hue" default="0" min="0" max="360" decimals="3">
+                <name> Hue</name>
+        </parameter>
+        <parameter type="animated" name="av.saturation" default="0.5" min="0" max="1" decimals="3">
+                <name>Saturation</name>
+        </parameter>
+       <parameter type="animated" name="av.lightness" default="0.5" min="0" max="1" decimals="3">
+                <name>Lightness</name>
+        </parameter>
+        <parameter type="animated" name="av.mix" default="1" min="0" max="1" decimals="3">
+                <name>Mix</name>
+        </parameter>
+</effect>