end-of-line normalization for all remaining files

Some files have still not been normalized. Please see the commit-messages for what I've done and how I verified the result.

.gitattributes has been updates to explicitly list all pictures, exes, etc. as well as some other known-to-be-data files.

After this pull-request,
grep -lrP '\r'   --exclude=\*.{png,gif,jar,jpeg,jpg,exe,JPG,ico,ortho,swf}   --exclude=\*.{bat,icns,dll,bmp,ttf} 
will only show four known data-files, which are listed in gitattributes.