TYPO3 Core

The HTTP protocol knows the Accept-Ranges header to support partial downloads.
With incoming header HTTP_RANGE only a part of the requested file can be requested.

With this resumable downloads are possible when downloading af file via FileDumpEID.

Needed changes:

- range support in ResourceStorage::dumpFileContents()
- range support to the FileDriver for instance FileDriver::dumpPartialFileContents($identifier, $start, $end);
- when only a range is requested header HTTP/1.1 206 Partial Content should be set together with Content-Range: bytes ...
- header Accept-Ranges: bytes should be set to tell the remote the partial content is supported

Think we should introduce a new Interface PartialFileDumpInterface or something to tell that the a driver supports this.
When the driver doesn't support this we use getForLocalProcessing() in the ResourceStorage to read the requested part of the file.

Example implementation or the partial content: https://github.com/beechit/fal_securedownload/blob/5dfa1a09f976df2e8d344c3af90be29469fe213a/Classes/Hooks/FileDumpHook.php#L196