Implement tab-complete of registered wrapper commands

[suresttexas00]

serverconnection.py parse:
Tab-Complete (clientbound)
"""
The server responds with a list of auto-completions of the last word sent to it. In the case of regular
chat, this is a player username. Command names and parameters are also supported. The client lists
these in the order that they are in the array.
"""

Field Name	Field Type		Notes
Count		VarInt			Number of elements in the following array
Matches		Array of String		One eligible command, a single string,

grab wrapper's registered commands, append it to these, resort aphabetically, and re-insert into packet...