Added a new sort method "Date Taken" for pictures + add-on support for the new SORT_METHOD_DATE_TAKEN.
Merge pull request #2377 from rubpa/picsort

add new sort method "Date Taken" for pictures
rss: cosmetics and cleanup
rss: move IRssObserver into seperate header file
CRssReader: use CCriticalSection member instead of deriving from it
move CRssManager into seperate header/source files
CRssManager: turn into a singleton
move reading of RssFeeds.xml from CSettings into CRssManager
[win32] update VS project files
[osx/ios/atv2] - sync xcode projects
Merge pull request #2374 from Montellese/settings_cleanup_2

RSS reader/manager restructuring