Server: object scaling can be turned off

Server: object scaling can be turned off

A dedicated server can stop players resizing the objects they place.

- "allow_object_scaling" in the config's "players" section (default true),
  and "object-scaling on|off" from the console or an admin. A change is
  saved and applies at once.
- Off: the server shares every player's objects at their own size, whatever
  that player's game sent. Admins can still resize theirs, as with the
  object limit.
- The roster tells each game. In the park editor of a player on such a
  server the SCALE mode is not offered, its Y shortcut does nothing, the
  scale box is disabled with a note saying why, and what is placed or edited
  is its own size.
- An object resized before the setting was turned off is its own size for
  everyone else straight away; its owner sees it resized until they edit it.

Server/server_commands.cpp

@@ -16,7 +16,7 @@ constexpr std::string_view help_text =
     "status | net [player] | players | say <text> | msg <player> <text> | msg-party <player> <text> | msg-admins <text> | kick <player> | ban <player or SteamID64> [name] | unban <SteamID64> | bans\n"
     "map <name, e.g. San Vansterdam> | maps | name <text> | password <text|off> | welcome <text|off> | listed on|off\n"
     "voice on|off | voice-range <50-1000> | distances <full> <half> <half-return> <low> | crowd <n>|off | rate <KB/s> | bone-scale <1-8>|off\n"
-    "placement everyone|admins|nobody | objects <number>|off | clear-objects | noclip on|off | nobail on|off | boosts on|off | tuning on|off\n"
+    "placement everyone|admins|nobody | objects <number>|off | object-scaling on|off | clear-objects | noclip on|off | nobail on|off | boosts on|off | tuning on|off\n"
     "tpall [player] | tphere <player> | votes [map|kick|tod on|off|<percent>] | vote-cancel\n"
     "map-pool [add|remove <map>|clear] | rotation [<minutes>|off]\n"
     "park <lot> <layout> | park random | layer-sync on|off | layer <key> default|on|off | tod <time|default>\n"
@@ -438,6 +438,14 @@ std::string Host::command(std::string_view line, std::uint64_t admin) {
         return changed(*limit ? "Each player can place up to " + std::to_string(*limit) + " objects. Admins are not limited."
                               : std::string("Players can place as many objects as they like."));
     }
+    if (name == "object-scaling") {
+        const auto value = on_off(argument);
+        if (!value) return std::string("object-scaling on|off (now ") + (config_.object_scaling ? "on" : "off") + ")";
+        config_.object_scaling = *value;
+        for (auto &[id, guest] : guests_) guest->shared_from = 0; // look at every layout again
+        return changed(*value ? "Players can resize the objects they place."
+                              : "Placed objects are their own size for everyone. Admins can still resize theirs.");
+    }
     if (name == "votes") {
         // votes | votes <map|kick|tod> on|off|<percent> | votes seconds|cooldown <n>
         const auto [what_text, value_text] = split(argument);