Implement a number of small fixes

src/main/java/net/fretux/skillengine/api/SkillEngineAPI.java

@@ -20,11 +20,11 @@ public final class SkillEngineAPI {
     private SkillEngineAPI() {}
 
     public static ResourceLocation id(String path) {
-        return new ResourceLocation(SkillEngine.MODID, path);
+        return ResourceLocation.fromNamespaceAndPath(SkillEngine.MODID, path);
     }
 
     public static ResourceLocation rl(String namespace, String path) {
-        return new ResourceLocation(namespace, path);
+        return ResourceLocation.fromNamespaceAndPath(namespace, path);
     }
 
     public static SkillNode getSkillNode(ResourceLocation id) {

src/main/java/net/fretux/skillengine/client/SkilltreeScreen.java

@@ -451,7 +451,16 @@ public class SkilltreeScreen extends Screen {
         } else if (unlocked) {
             color = 0xFF44CC44;
         } else {
-            color = 0xFF444444;
+            int cost = node.getCost();
+            if (cost <= 1) {
+                color = 0xFF444444;
+            } else if (cost == 2) {
+                color = 0xFFFF6633;
+            } else if (cost == 3) {
+                color = 0xFF33CCCC;
+            } else {
+                color = 0xFFFFD700;
+            }
         }
         return color;
     }

src/main/java/net/fretux/skillengine/events/SkillEnginePlayerEvents.java

@@ -32,6 +32,17 @@ public class SkillEnginePlayerEvents {
         }
     }
 
+    @SubscribeEvent
+    public static void onClone(PlayerEvent.Clone event) {
+        if (event.getEntity() instanceof ServerPlayer newPlayer && event.getOriginal() instanceof ServerPlayer oldPlayer) {
+            oldPlayer.getCapability(SkillEngineCapabilities.PLAYER_SKILLS).ifPresent(oldData ->
+                newPlayer.getCapability(SkillEngineCapabilities.PLAYER_SKILLS).ifPresent(newData -> {
+                    newData.load(oldData.save());
+                })
+            );
+        }
+    }
+
     @SubscribeEvent
     public static void onRespawn(PlayerEvent.PlayerRespawnEvent event) {
         if (event.getEntity() instanceof ServerPlayer player) {