Lossless optimisation of png files in Breeze icon theme, using ImageOptim.
Saved ~324KB out of 669KB. ~53% per file on average (up to 78%).

Change-Id: Ifbd936473f75cb1e6698facf40e90433f002905c
Signed-off-by: Andrew <dent.ace@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/14900Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>