Move Plex to API-driven plugin and fix NoClassDefFoundError on startup

server/src/main/java/dev/plex/services/AbstractService.java

@@ -0,0 +1,31 @@
+package dev.plex.services;
+
+import dev.plex.PlexBase;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+public abstract class AbstractService implements IService, PlexBase
+{
+    private boolean asynchronous;
+    private boolean repeating;
+
+    @Setter
+    private int taskId;
+
+    public AbstractService(boolean repeating, boolean async)
+    {
+        this.repeating = repeating;
+        this.asynchronous = async;
+    }
+
+    public void onStart()
+    {
+
+    }
+
+    public void onEnd()
+    {
+
+    }
+}