GH-56: Customize option name for slash command

[utarwyn]

Description

Using slash command is now supported in the module. In the first version I used opponent as the option to provide the name of an user to play with. It seems legit to provide you a way to customize this name and put your own if wanted.

This PR brings that support. You must reload your command using ?tttdeploy after each change.

New configuration option

Module versionning	Option name
v3.x.x	commandOptionName
v2.2.x	slashCommandOptionName

Example

Here is an example on how to rename it player using v2.2.x:

{
    "slashCommandOptionName": "player"
}

And how it looks after deployed:

🌂Closes #56
🚀 Will be available from v2.2.x and v3.0.0.

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