Add ability for host to change game name

[11EJDE11]

Adds the ability for the host to change a game's lobby name from within the lobby itself. The host can type:

/gamename <newname>

The new name is validated, then broadcast to all online players, and all players in the channel.

I've moved the lobby name validation checks to the NameValidator.cs file.

[github-actions[bot]]

Nightly build for this pull request:

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[SadPencil]

yeah, the CnCNet lobby is different from a game (game room)

[SadPencil]

please double check the lobby stuffs in the git diff. I saw this word again in the XML comment.

[GrantBartlett]

I just tested this locally, there is a problem:

As player 1 (Host)

1. Create a game
2. Change the game room name

As player 2

1. Do not join the game, wait for the game room name to change
2. Attempt to join the room. You will see an error saying "Incorrect password"

[11EJDE11]

I just tested this locally, there is a problem:

Fixed now.

[11EJDE11]

Closing as I'll do a new PR with a GUI and more options.