Added xml interface for the frei0r_bigsh0t_eq_to_stereo

data/effects/frei0r/frei0r_bigsh0t_eq_to_stereo.xml

+<!DOCTYPE kpartgui>
+<effect tag="frei0r.bigsh0t_eq_to_stereo" id="frei0r.bigsh0t_eq_to_stereo">
+	<name>VR360 Equirectangular to Stereo</name>
+	<description>Projects a stereographic image from an equirectangular. Use this to create the little planet effect from a VR360 footage.</description>
+	<author>libavfilter</author>
+	<parameter type="animated" name="0" min="-360" max="360" default="0" decimals="3" suffix="° deg">
+		<name>Yaw</name>
+	</parameter>
+	<parameter type="animated" name="1" min="-180" max="180" default="-90" decimals="3" suffix="° deg">
+		<name>Pitch</name>
+	</parameter>
+	<parameter type="animated" name="2" min="-180" max="180" default="0" decimals="3" suffix="° deg">
+		<name>Roll</name>
+	</parameter>
+	<parameter type="animated" name="3" min="-180" max="180" default="160" decimals="3" suffix="° deg">
+		<name>FOV</name>
+	</parameter>
+	<parameter type="animated" name="4" min="0" max="100" default="100" decimals="0" suffix=" %">
+		<name>Amount</name>
+	</parameter>
+	<parameter type="list" name="5" default="0" paramlist="0;1">
+        <paramlistdisplay>Nearest-neighbor,Bilinear</paramlistdisplay>
+                <name>Interpolation</name>
+        </parameter>
+</effect>