Implement detection for resetting points and add remaining skillpoints in tree screen

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

@@ -12,6 +12,7 @@ import java.util.Set;
 
 public class SkilltreeClientState {
     private static final Set<ResourceLocation> unlocked = new HashSet<>();
+    private static int currentSkillPoints = 0;
 
     public static void unlockNode(ResourceLocation id) {
         SkillEngine.LOGGER.info("[CLIENT] Unlocking node: {}", id);
@@ -41,4 +42,12 @@ public class SkilltreeClientState {
         unlocked.clear();
         unlocked.addAll(ids);
     }
+
+    public static void setCurrentSkillPoints(int points) {
+        currentSkillPoints = points;
+    }
+
+    public static int getCurrentSkillPoints() {
+        return currentSkillPoints;
+    }
 }