Fixed issue with category filter selection on xs and sm displays.
Displaying the home page no longer changes the item filter to unread.
Notification message when marking multiple items as read or as starred.
libcurl initialization
Configuration for checksum retain count.
Configuration for item retain count.
Timeout values are now configured in milliseconds.
HTTP client select timeout is now configurable by applications.
Duplicate item detection is now based on CRC32 checksums.
Implemented item cleanup.
Added support for transactions to SQLite3 wrapper.
Cleaned up SQLite3 wrapper.
Various refactorings throughout.