Add lobby particle slot menus

Replace the particle inventory with a main menu showing the 7 slots and
unlocked presets, a slot editor with a read-only view for locked slots,
and an entry editor with pickers for designs, choices, colours and icons.
Slots are limited to 10 entries and a particles-per-tick budget.

LobbySystem/src/de/steamwar/lobby/particle/slot/ParticleSlots.java

@@ -22,7 +22,9 @@ package de.steamwar.lobby.particle.slot;
 import com.google.gson.JsonParser;
 import de.steamwar.lobby.LobbySystem;
 import de.steamwar.lobby.particle.ParticleRequirement;
+import de.steamwar.sql.SteamwarUser;
 import de.steamwar.sql.UserConfig;
+import de.steamwar.sql.UserPerm;
 import lombok.experimental.UtilityClass;
 
 import java.util.logging.Level;
@@ -31,8 +33,14 @@ import java.util.logging.Level;
 public class ParticleSlots {
 
     public final int COUNT = 7;
+    public final int MAX_ENTRIES = 10;
     private final String KEY_PREFIX = "lobby-particle-slot-";
 
+    // Particle positions per tick a slot may spawn
+    public double maxCost(SteamwarUser user) {
+        return user.hasPerm(UserPerm.TEAM) ? 80 : 40;
+    }
+
     // Slots 1-3 for everyone, 4-5 for team members, 6-7 for the server team
     public ParticleRequirement requirement(int index) {
         if (index < 3) return ParticleRequirement.NO_REQUIRMENT;