RingMainWindow : add notification to pending contact request tab

- at the application startup and when the user chooses another account,
we show notification on pending contact requests.

[guillaume: ci msg meaning change]
[guillaume: code cleanup for QA]

Change-Id: I549dd5f83783738ad5cd5fed5bf0740eb17b6544
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
diff --git a/pixmaps/ic_verified_user_black_24px_with_notification.svg b/pixmaps/ic_verified_user_black_24px_with_notification.svg
new file mode 100644
index 0000000..051e0fd
--- /dev/null
+++ b/pixmaps/ic_verified_user_black_24px_with_notification.svg
@@ -0,0 +1,65 @@
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