Multiple birds, one commit

Here's a list of things I've fixed/mitigated:
- Range bans in ban-related commands (FS-209)
- Bug in /tempban where the duration in the broadcast is always wrong
- Over-complicated handling of /tempban durations (instead of trying to process them and silently fail, it'll flat out say that an invalid duration is well, invalid)
- Inconsistent "player not found" messages in banning commands
- (Mitigates) weird issue with case-sensitive usernames in banning commands when the server has restarted since a player last joined
- (Mitigates) banned IPs being inaccurate when a player was banned offline whilst containing multiple IPs in their playerdata
- Redoing how MovementValidator handled positive and negative infinity exploit items, completely removing the need for Mojangson in the first place and allowing the plugin to run without Essentials once more in the process (related to FS-406)

Here is what I've done in addition:
- Merged /tban and /noob into /tempban, which now bans for 5 minutes by default (FS-205)

src/main/java/me/totalfreedom/totalfreedommod/MovementValidator.java

@@ -1,17 +1,16 @@
 package me.totalfreedom.totalfreedommod;
 
-import ca.momothereal.mojangson.ex.MojangsonParseException;
-import ca.momothereal.mojangson.value.MojangsonCompound;
-import ca.momothereal.mojangson.value.MojangsonValue;
+import com.google.common.collect.Multimap;
 import io.papermc.lib.PaperLib;
-import java.util.List;
+
+import java.util.Collection;
+import java.util.Map;
 import java.util.Objects;
-import net.minecraft.server.v1_16_R3.NBTTagCompound;
-import net.minecraft.server.v1_16_R3.NBTTagList;
 import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.Material;
-import org.bukkit.craftbukkit.v1_16_R3.inventory.CraftItemStack;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.attribute.AttributeModifier;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -20,6 +19,7 @@ import org.bukkit.event.player.PlayerLoginEvent;
 import org.bukkit.event.player.PlayerMoveEvent;
 import org.bukkit.event.player.PlayerTeleportEvent;
 import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
 
 public class MovementValidator extends FreedomService
 {
@@ -133,55 +133,49 @@ public class MovementValidator extends FreedomService
 
     private Boolean exploitItem(ItemStack item)
     {
-        net.minecraft.server.v1_16_R3.ItemStack nmsStack = CraftItemStack.asNMSCopy(item);
-        NBTTagList modifiers = getAttributeList(nmsStack);
-        MojangsonCompound compound = new MojangsonCompound();
-        boolean foundNegative = false;
-        boolean foundPositive = false;
-        try
+        if (item == null)
         {
-            String mod = modifiers.toString();
-            String fancy = ("{" + (mod.substring(1, mod.length() - 1).replace("{", "").replace("}", "")) + "}");
-            compound.read(fancy);
-            for (String key : compound.keySet())
+            return false;
+        }
+
+        ItemMeta meta = item.getItemMeta();
+        if (meta != null)
+        {
+            Multimap<Attribute, AttributeModifier> attributes = meta.getAttributeModifiers();
+            if (attributes != null)
             {
-                if (Objects.equals(key, "Amount")) //null-safe .equals()
+                Map<Attribute, Collection<AttributeModifier>> attrMap = attributes.asMap();
+
+                // For every attribute...
+                for (Attribute attr : attributes.keySet())
                 {
-                    @SuppressWarnings("rawtypes")
-                    List<MojangsonValue> values = compound.get(key);
-                    for (MojangsonValue<?> val : values)
+                    // Default values
+                    boolean posInf = false;
+                    boolean negInf = false;
+
+                    // For every AttributeModifier...
+                    for (AttributeModifier modifier : attrMap.get(attr))
                     {
-                        if (val.getValue().toString().equals("Infinityd"))
+                        // Are they ∞ or -∞?
+                        if (modifier.getAmount() == Double.POSITIVE_INFINITY)
                         {
-                            foundPositive = true;
+                            posInf = true;
                         }
-                        if (val.getValue().toString().equals("-Infinityd"))
+                        else if (modifier.getAmount() == Double.NEGATIVE_INFINITY)
                         {
-                            foundNegative = true;
+                            negInf = true;
                         }
                     }
+
+                    // Are both values set as true?
+                    if (posInf && negInf)
+                    {
+                        return true;
+                    }
                 }
             }
-        }
-        catch (MojangsonParseException e)
-        {
-            e.printStackTrace();
-        }
-        return foundNegative && foundPositive;
-    }
 
-
-    private NBTTagList getAttributeList(net.minecraft.server.v1_16_R3.ItemStack stack)
-    {
-        if (stack.getTag() == null)
-        {
-            stack.setTag(new NBTTagCompound());
         }
-        NBTTagList attr = stack.getTag().getList("AttributeModifiers", 10);
-        if (attr == null)
-        {
-            stack.getTag().set("AttributeModifiers", new NBTTagList());
-        }
-        return stack.getTag().getList("AttributeModifiers", 10);
+        return false;
     }
 }