Ant buildtools: added base class for Kotlin compiler ant tasks.

As side effect:
 - used cli compiler in both ant tasks.
 - got the ability to use custom args in JS ant task too.

annotations/org/apache/tools/ant/types/annotations.xml

@@ -1,5 +1,8 @@
 <root>
+  <item name='org.apache.tools.ant.types.Path java.lang.String[] list()'>
+    <annotation name='org.jetbrains.annotations.NotNull'/>
+  </item>
   <item name='org.apache.tools.ant.types.Path org.apache.tools.ant.types.Path createPath()'>
     <annotation name='org.jetbrains.annotations.NotNull'/>
   </item>
-</root>
+</root>