chat/halloy: Import halloy-2024.12

Halloy is an open-source IRC client written in Rust, with the Iced GUI
library. It aims to provide a simple and fast client for Mac, Windows, and
Linux platforms.

Features:
* IRCv3.2 capabilities
* SASL support
* DCC Send
* Keyboard shortcuts
* Auto-completion for nicknames, commands, and channels
* Notifications support
* Multiple channels at the same time across servers
* Commandbar for for quick actions
* Custom themes
* Portable mode
