update 16px breeze icons

[kainz.a]

Hi PIM Team,

Jens Reuerberg told me that the 16px mail- icons are difficult to recognize
(I agree) so I update the icons

http://commits.kde.org/breeze-icons/c6a14733cb33db5eb3348b9575a56cbb8b1b5cb5

I also add some new icons which you can use for mail-forward-...

I personaly think that all other icons fit but if not, please leave a bug
report cause I love fix bug's.

cheers
Andreas Kainz
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