[Pre-Release] TeamSpeak 3 Server 3.9.0

[dante696]

We are pleased to announce that our TeamSpeak Server version 3.9.0. Beta is now available.

Here are some of the main changes and features

• Anyone who owns any of the new license types can now use their license.
• The server now allows to add (or remove) multiple users to same group
  or a single user to multiple groups without the need to send multiple commands.
• Clients with active b_virtualserver_join_ignore_password can now use
  temporary passwords with channel as a target.
• The channeledit command can no longer be used to set a channel icon.
  The command channeladdperm need to be used.
• The server now shows the invoker when command notification came from a plugin.
• We fixed the start script. Now the script should find when a instance is running already.

Here is the full change log (in our new format)

## Server Release 3.9.0 24 June 2019

### Added
- Support for new license types (Gamer, Commercial, Sponsorship).
- `clientaddservergroup` and `clientdelservergroup` allowing to add and remove one
  or more server groups to a client.

### Changed
- `servergroupaddclient` and `servergroupdelclient` allow to add and remove one
  or more clients to a server group.
- `quit` can be used while being flood banned.
- `channeledit`, `channelpermlist` and `custominfo` return 
  more appropriate error codes.
- `servertemppasswordadd` does not allow a zero duration.
- Parsing of boolean parameters has been made more restrictive.
- Plugin command notifications contain invoker data.

### Fixed
- QueryAdmin-Password and ServerAdmin-Token are printed again, when starting the
  TeamSpeak 3 Server using the startscript or with the daemon parameter.
- A crash related to 'set_option: Bad file descriptor' has been fixed.
- Temporary passwords are being checked for clients with the
  ignore server password priviledge. 
- A bug where some ServerQuery notifications were sent twice after using
  `servernotify`
- `serverlist -short -uid` works as expected now.
- `clientlist -badges` shows all client badges again.
- Startscript checks if instance is already running.
- Server did not start any longer on some Linux systems 
  Thank you 'Ragyal'.

Here you can download the beta server

Docker users can build the server with command

docker build "https://github.com/TeamSpeak-Systems/teamspeak-linux-docker-images.git#:alpine" --build-arg TEAMSPEAK_CHECKSUM=a0c185066c32b39c7d49e163c9aabdeaa43fc425aa3e67692b8af5c21755ab72 --build-arg TEAMSPEAK_URL=https://files.teamspeak-services.com/pre_releases/server/3.9.0-beta2/teamspeak3-server_linux_alpine-3.9.0-beta2.tar.bz2 --tag teamspeak:latest --tag teamspeak:3.9 --tag teamspeak:3.9.0-beta2

Please let us know if there are "release related" questions, suggestions in your mind or if have problems with this version.
Here you can leave your feedback and discuss about the release.

[dante696]

Beta 2 is available now (change log and links can be found in Post #1)

These are the change since Beta 1
- With the help from Ragyal we finally could figure out why the server did not start on Linux.
Thank you again!
- The optional parameter -continueonerror did not work on some commands and we added them into the documentation.
There are some known errors left. We aim to fix these for the stable release