Function subscribe 

pub unsafe fn subscribe(
    sub: *mut ExtrasSubscriberInfo,
    extras_addon: &RawExtrasAddonInfo,
    name: &'static str,
    squad_update: Option<RawExtrasSquadUpdateCallback>,
    language_changed: Option<RawExtrasLanguageChangedCallback>,
    keybind_changed: Option<RawExtrasKeybindChangedCallback>,
    squad_chat_message: Option<RawExtrasSquadChatMessageCallback>,
    chat_message: Option<RawExtrasChatMessageCallback>,
)

Subscribes to unofficial extras callbacks after checking for compatibility.

Unsupported callbacks will be skipped.

Safety

Info needs to point to a valid to interpret as subscriber infos with minimum version of ExtrasVersion::MIN_SUB_INFO. It is passed as pointer to prevent UB by creating a reference to the wrong type.

Name needs to be null-terminated.