Ends the practice of storing the CommandSender in Messaging.

[LlmDl]

• Refactors various methods to accept the CommandSender we already had.
• Removes Messaging#send(String)
• Removes Messaging#save(CommandSender)
• Removes Messaging#save(Player)
• Closes potential memory leak found by illumeleet.
• Closes #20

[LlmDl]

Yeah this was more of a "oh this was being done huh?" sort of thing.