teamspeak5_client: 5.0.0-beta77 -> 6.0.0-beta2; teamspeak refactors (#377748)
* teamspeak5_client: 5.0.0-beta77 -> 6.0.0-beta2, rename to teamspeak-6-client
* teamspeak6-client: refactor
* lib.licenses: add teamspeak license
* teamspeak{3,_server,6-client}: use teamspeak license
* teamspeak{6-client,_server}: move to pkgs/by-name
* teamspeak_server: fix meta.platforms
* teamspeak6-client: add update script
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