No Prying Eyes

Adds a new signing mode called ON_DEMAND

This mode makes it so that signing is disabled by default, but is enabled for one session if a server enforces chat signing, and is disabled again when the user leaves that server.

If signing is enabled for a session, the following warning message is sent in chat (visible only to the mod user, not to other players on the server)

The signing mode in your config is set to ON_DEMAND. This option enables message signing whenever a server demands it, and disables it when you exit that server, which means that all messages that you send on that particular server can be reported. The server you are currently in is one such server, and as such, all messages you send on this server can be reported. Chat with caution.

Attention, modpack authors:

To change the above warning message for your pack's users, change the resources/assets/npe/lang/en_us.json file using a resource pack.

The translation key for the warning is "npe.warning.on_demand".