Server policies

[personalized-advertising]

The server can now define a set of policies for freecam mod users, i.e disabling clipping or freecam entirely, much more fine-grained than #547 as you requested.

You can implement this now and then if you later want to make a server-side mod its as simple as doing this from the server:

public static final String FREECAM_POLICY_CHANNEL = "freecam:server_config";

public static void sendFreecamPolicy(Player player, boolean allowFreecam, boolean allowClipping, boolean allowFullbright, boolean allowInteract) {
    String json = """
            {
              "allowFreecam": %s,
              "allowClipping": %s,
              "allowFullbright": %s,
              "allowInteract": %s
            }
            """.formatted(
            allowFreecam,
            allowClipping,
            allowFullbright,
            allowInteract
    );
	
    player.sendPluginMessage(FREECAM_POLICY_CHANNEL, json.getBytes(StandardCharsets.UTF_8));
}

Untested, especially the forge code.