We now have our own handler for chunked transfer of a recording file, so remove third-party one.
Rework 'resource' endpoint -- changes to mimetypes; new chunked transfer code; etc.
Share namespace prefix declarations; add 'unit:' and 'sleep:'.
Allow for labels, etc being Unicode.
Use the absolute path when setting 'server_path' option.
Save streamed recordings directly in 'options.recordings_path', not under './streamed/'.