assetfile handles: optimizations

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3825 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
assetfile handles: optimizations // bugfixes

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3826 1f8fe7d8-47f0-464c-8d0a-336f4953ab05
build auto version (2941) ...

git-svn-id: http://www.pimcore.org/svn/pimcore/private/core/trunk@3827 1f8fe7d8-47f0-464c-8d0a-336f4953ab05