Added command to set a trekker's emblem stats

Usage:
`!e [character id] [slot id - this is between 1 and 3] [attr 1] [attr 2] [attr 3] [attr 4]`

Example:
`!e 141 1 1004 1004 1004 1004` = Sets the first emblem of the character to all +ignis damage.

Notes:
Attribute ids can be found in `CharGemAttrValue.json` in the resources/bin folder.

src/main/java/emu/nebula/command/commands/EmblemCommand.java

@@ -0,0 +1,104 @@
+package emu.nebula.command.commands;
+
+import emu.nebula.util.Utils;
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import emu.nebula.game.character.CharacterGem;
+import emu.nebula.game.character.GameCharacter;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.PubilcGm.Chars;
+
+import emu.nebula.command.Command;
+import emu.nebula.command.CommandArgs;
+import emu.nebula.command.CommandHandler;
+import emu.nebula.data.GameData;
+
+@Command(
+        label = "emblem", 
+        aliases = {"e", "gem"}, 
+        permission = "player.emblem", 
+        requireTarget = true,
+        desc = "!emblem [characterId] [emblem slot] [attribute value ids....]"
+)
+public class EmblemCommand implements CommandHandler {
+
+    @Override
+    public String execute(CommandArgs args) {
+        // Init
+        var player = args.getTarget();
+        
+        // Sanity check
+        if (args.getList().size() < 6) {
+            return "Error: Not enough args";
+        }
+        
+        // Parse args
+        var charId = Utils.parseSafeInt(args.getList().get(0));
+        var slotId = Utils.parseSafeInt(args.getList().get(1));
+        var attributes = new IntArrayList();
+        
+        for (int i = 2; i < 6; i++) {
+            int attr = Utils.parseSafeInt(args.getList().get(i));
+            var data = GameData.getCharGemAttrValueDataTable().get(attr);
+            if (data == null) {
+                return "Error: Invalid attribute value id in position " + (i - 2);
+            }
+            
+            attributes.add(attr);
+        }
+        
+        // Get character
+        GameCharacter character = player.getCharacters().getCharacterById(charId);
+        
+        if (character == null) {
+            return "Error: No trekker selected";
+        }
+        
+        // Get gem slot
+        var slot = character.getGemSlot(slotId);
+        
+        if (slot == null) {
+            return "Error: Invalid slot selected";
+        }
+        
+        // Get gem
+        var preset = character.getCurrentGemPreset();
+        var gem = slot.getGem(preset.getGemIndex(slotId));
+        
+        if (gem == null) {
+            if (slot.isFull()) {
+                // Equip the first gem we can find
+                preset.setGemIndex(slotId, 0);
+                gem = slot.getGem(preset.getGemIndex(slotId));
+            } else {
+                // Create a new gem and equip it
+                gem = new CharacterGem(attributes);
+                
+                // Add gem to slot
+                slot.getGems().add(gem);
+                
+                // Equip
+                preset.setGemIndex(slotId, slot.getGems().size() - 1);
+            }
+            
+            // Make sure gem exists
+            if (gem == null) {
+                return "An unknown error has occured";
+            }
+        }
+        
+        // Replace gem
+        gem.setAttributes(attributes);
+        
+        // Save
+        character.save();
+        
+        // Encode and send
+        var proto = Chars.newInstance()
+                .addList(character.toProto());
+        
+        player.addNextPackage(NetMsgId.chars_final_notify, proto);
+        
+        // Result
+        return "Updated emblem for character";
+    }
+}

src/main/java/emu/nebula/game/character/CharacterGem.java

@@ -26,6 +26,10 @@ public class CharacterGem {
         this.locked = locked;
     }
     
+    public void setAttributes(IntList attributes) {
+        this.attributes = attributes.toIntArray();
+    }
+
     public void setNewAttributes(IntList attributes) {
         this.alterAttributes = attributes.toIntArray();
     }

src/main/java/emu/nebula/game/character/CharacterGemPreset.java

@@ -27,7 +27,9 @@ public class CharacterGemPreset {
         return this.getGems().length;
     }
     
-    public int getGemIndex(int slotIndex) {
+    public int getGemIndex(int slotId) {
+        int slotIndex = slotId - 1;
+        
         if (slotIndex < 0 || slotIndex >= this.getLength()) {
             return -1;
         }

src/main/java/emu/nebula/game/character/CharacterGemSlot.java

@@ -36,6 +36,10 @@ public class CharacterGemSlot {
         return getGems().size() >= GameConstants.CHARACTER_MAX_GEMS_PER_SLOT;
     }
     
+    public boolean isEmpty() {
+        return getGems().size() <= 0;
+    }
+    
     // Proto
     
     public CharGemSlot toProto() {