Use supported urllib, GStreamer and WebKitGTK APIs on current Gentoo.

--- a/foobnix/dm/dm_dowloader.py
+++ b/foobnix/dm/dm_dowloader.py
@@ -12,5 +12,5 @@
 import threading
 from foobnix.fc.fc import FC
-from urllib.request import FancyURLopener
+from urllib.request import build_opener
 from foobnix.util.time_utils import size2text
 from foobnix.util.file_utils import get_file_extension
@@ -45,3 +45,3 @@
-        opener = FancyURLopener()
+        opener = build_opener()
         remote = opener.open(bean.path)
         remote_size = 0
--- a/foobnix/gui/engine/gstreamer.py
+++ b/foobnix/gui/engine/gstreamer.py
@@ -23,5 +23,5 @@
 from foobnix.util.const import STATE_STOP, STATE_PLAY, STATE_PAUSE, FTYPE_RADIO

-Gst.init("")
+Gst.init(None)


--- a/foobnix/gui/service/vk_service.py
+++ b/foobnix/gui/service/vk_service.py
@@ -10,5 +10,6 @@
 import os
 import gi
-gi.require_version("WebKit2", "4.0")
+gi.require_version("WebKit2", "4.1")
+gi.require_version("Soup", "3.0")

 import threading