impreove configuration of listenres

[Licenser]

Currently the listeners only allow 1 listener per decode, a better way to handle it would be:

listensers.my-name.type = influx
listensers.my-name.port = 8888
listensers.my-name.bucket = "bucket"

and build the struct based on that.

[Licenser]

perhaps .protocl instead of .type

the current protocol can be inferred from the type, as it doesn't make sense to have a influx udp listener or a syslog http listener.

[Licenser]

cc @davecromberge

[davecromberge]

Those look like some sensible improvements 👍