Expose clear method for packed arrays

doc/classes/PackedVector3Array.xml

@@ -54,6 +54,12 @@
 				[b]Note:[/b] Calling [method bsearch] on an unsorted array results in unexpected behavior.
 			</description>
 		</method>
+		<method name="clear">
+			<return type="void" />
+			<description>
+				Clears the array. This is equivalent to using [method resize] with a size of [code]0[/code].
+			</description>
+		</method>
 		<method name="count" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="value" type="Vector3" />