GH-51: Play using Discord buttons

[utarwyn]

Description

A recent Discord feature allows us to use buttons in addition of reactions to interact with messages.
The main idea of that PR is to use buttons instead of reactions to handle tic-tac-toe gameboards, as described in issue #51.

Keep in mind that although buttons will be the default choice, you can still use reactions by setting a configuration value. See below for more information on this. Also, custom emojies are applied to buttons if defined in the config. Gameboard using buttons is also deleted after a game if specific config value is enabled.

Here is a preview of how it looks using a slash command:

Here is how to disable it (and come back to reactions):

{
    "gameBoardReactions": true
}

🌂Closes #51
🚀 Will be available from v3.0.x.

[sonarcloud]

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