Added Blacklist/Whitelist Support for all proxies.
Added option to add proxy.pac script urls as a proxy

git-svn-id: svn://svn.jdownloader.org/jdownloader/browser@25355 ebf7c1c2-ba36-0410-9fe8-c592906822b4
Browser:
-move selectProxy to openRequestConnection
RequestHeader: use HeaderCollection internally

git-svn-id: svn://svn.jdownloader.org/jdownloader/browser@25357 ebf7c1c2-ba36-0410-9fe8-c592906822b4