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

server/src/main/java/dev/plex/permission/Permission.java

@@ -0,0 +1,14 @@
+package dev.plex.permission;
+
+import dev.morphia.annotations.Entity;
+import java.util.UUID;
+import lombok.Data;
+
+@Data
+@Entity
+public class Permission
+{
+    private final UUID uuid;
+    private final String permission;
+    private boolean allowed = true;
+}