Version 3.15.2
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- Fixed more deprecation warnings (again). (Alberts Muktupāvels)
- Fixed evolution opening from clock applet. (Alberts Muktupāvels)
- Stop using GtkPlug/GtkSocket for in process applets. (Alberts Muktupāvels)
- Applets are build as in process applets. (Alberts Muktupāvels)
- Don't set background color for GtkMenuBar in panel. It breaks transparent
  panels. (Alberts Muktupāvels)
- Fix crash in clock applet. (Alberts Muktupāvels)
- Use dbus to register with session manager, drop libegg. (Alberts Muktupāvels)
- Restored ability to have transparent panels. (Alberts Muktupāvels)
- Updated translations:
  Milo Casagrande (it), Piotr Drąg (pl), Sweta Kothari (gu), Tiago S (pt),
  Timo Jyrinki (fi), Tom Tryfonidis (el).