Add tasks for all the new languages

Task/Filter/Phix/filter-1.phix

@@ -0,0 +1,9 @@
+function filternd(sequence array, integer filterid)
+sequence res = {}
+    for i=1 to length(array) do
+        if call_func(filterid,{array[i]}) then
+            res = append(res,array[i])
+        end if
+    end for
+    return res
+end function

Task/Filter/Phix/filter-2.phix

@@ -0,0 +1,26 @@
+function filterd(sequence a, integer filterid)
+integer l = 0
+    for i=1 to length(a) do
+        if call_func(filterid,{a[i]}) then
+            l += 1
+            a[l] = a[i]
+        end if
+    end for
+    return a[1..l]
+end function
+
+function even(integer i)
+    return and_bits(i,1)=0
+end function
+constant r_even = routine_id("even")
+
+procedure main()
+sequence s = tagset(10), t
+    t = filterd(s,r_even)
+    ?s
+    ?t
+    -- automatic pass by reference occurs here for s:
+    s = filterd(s,r_even)
+    ?s
+end procedure
+main()