* [RAPPS] add snapshot url support
* [RAPPS] fix snapshot prev window won't update if size not changed
* [RAPPS] fix crash after cancel download
* [RAPPS] show broken-img if failed to create file / make network request
* [RAPPS] create a snapshots folder if it does not exist
* [RAPPS] add a helper function to perform callback
* [RAPPS] check bIsCancelled when handling ERROR_INVALID_HANDLE
* [RAPPS] remove W suffix for AsyncInetDownload
* [RAPPS] add assert for unknown event
* [RAPPS] Improve AsyncInetDownload error handling
* [RAPPS] move DisplayFailed to private, fix crash when cancelling
* [RAPPS] check for ERROR_INTERNET_OPERATION_CANCELLED
* [RAPPS] improve error logging
* [RAPPS] remove \r in error logging
* [RAPPS] rewrite AsyncInet
