4.8.4

=====
- Systray: Fix disappearing icons when drawing at 0,0 (bug #7057).
- Panel: Fix panel loading in kiosk mode.
- Common: Update online documentation help location.
- Launcher: Fix spacing in vertical panel with arrow on the side (bug #7584).
- Panel: Set window colormap and change autohide window type (bug #7435).
- Migrate: Fix 4.6 migration of action buttons (bug #7543).
- Libxfce4panel: Fix menu positioning for moved external plugins (bug #7529).
- Panel: Improve thread-safety.
- Libxfce4panel: Idle XfcePanelImage loading.
- Pager: Make the pager message less scary.
- Windowmenu: Do not update if screen is not initilized (bug #7728).
- Libxfce4panel: Keep blinking forever (bug #7583).
- Tasklist: Fix minimizing of active transient windows (bug #7674).
- Tasklist: Add a sorting mode for tasklist reordering with dnd (bug #7058).
- Translation updates (fi, sk, pt_BR, eu, nl).