plugins.zattoo: fix quantum tv streaming (#3108)
plugins.zattoo: fix quantum tv streaming (#3108)

quantum-tv had changed how their login worked:

- client token is hidden behind a obscure url
- they use zapi/v3
- session hello must only consist of token, uuid, app_version
gravyboat/streamlink,melmorabity/streamlink,streamlink/streamlink,gravyboat/streamlink,bastimeyer/streamlink,beardypig/streamlink,beardypig/streamlink,bastimeyer/streamlink,chhe/streamlink,streamlink/streamlink,melmorabity/streamlink,chhe/streamlink