Problem: Editors like gedit and others will not recognize *.xml.in files as xml, so if opened there is no syntax highlighting making those files harder to read.
This commit fixes this by adding <?xml version="1.0" encoding="UTF-8"?> to all *.xml.in files in lp:compiz 

Reduced combined filesizes of Compiz' .png resources from 2.2MB to 1.5MB by recompression of those with Trimage Image Compressor.
This will decrease package size, downloading/loading/displaying times without changing appearance in any way, because png is a lossless format and this commit just optimizes compression and filesizes.
png files with higher compression take less time to display, not only because of reduced loading times, but also because deflation in memory finishes faster as decompression speed is largely uninfluenced by the compression level and thus decompression of better compressed png files is faster.