Extend to user-installable app

[kevinlul]

On March 18, Discord announced that user-installed apps are in preview, whereas apps used to be installed on servers. This means we may be able to bring some Bastion interactions, e.g. Slash Commands, to direct messages, including group direct messages.

https://discord.com/developers/docs/tutorials/developing-a-user-installable-app
https://discord.com/developers/docs/change-log#userinstallable-apps-preview

[kevinlul]

discordjs/discord.js#10215

[kevinlul]

Launched, tied to "Use External Apps" permission on June 18: https://support.discord.com/hc/en-us/articles/23957313048343-Moderating-Apps-on-Discord#h_01HZQQQEAD1NCVP0MB1VQXV5C0

[kevinlul]

User-installed apps reached general availability https://discord.com/developers/docs/change-log#userinstalled-apps-general-availability

This task will be the next priority after Rush Duel search is released in #468

[kevinlul]

Note: due to no discord.js release, user-installable apps are not yet supported by the framework.

[kevinlul]

Support introduced in 14.16.0

[kevinlul]

Commands not using custom emojis could be immediately ported:

• /art
• /deck
• /help
• /id
• /link
• /locale (an alternate version is probably better because the options do not make sense)
• /metagame
• /ping
• /price
• /ygoprodeck
• /yugipedia

Commands using custom emoji that probably need app emojis to render correctly:

• /search
• /rush-duel

[kevinlul]

🚀 🚀 🚀

[kevinlul]

Need to account for server scenarios where the response MUST be ephemeral.

[kevinlul]

Summary of current launch blockers:

• Custom emoji do not work. Filter out all emojis from affected commands in the user-install context for now. App emojis can be implemented as follow-up.
• Server permissions have not been considered. In some cases, the command response must be ephemeral.
• How default locale will be determined and configured for user-installed commands have not been considered.

[kevinlul]

Server permissions do not need to be considered. Discord will force the embed to be ephemeral.

[kevinlul]

Update description and all description localizations to distinguish the user-install from the server-specific one.

[kevinlul]

(this is only needed in development, which uses different server-specific vs user-installed commands)