Assign a private range of tags to TA2/3 performers
The list of TA2 & TA3 performers was surprisingly hard to find. I am not sure whether I am missing performers (however they are easy to add).
This gives 1000 tag numbers to each performer, that they can use to add private fields to the API message with no fear of colliding with other performers. Closes #10 (closed).
The protocol buffers documentation states that tags 19000 through 19999 are reserved for protocol buffers implementations, so I started at 20000.