Added event when all expansions are loaded for developers.

src/main/java/me/clip/placeholderapi/events/ExpansionsLoadedEvent.java

@@ -0,0 +1,28 @@
+package me.clip.placeholderapi.events;
+
+
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * This event is ran when all expansions are loaded.
+ * This is done when reloading config, on plugin start and on server load.
+ * @author jacobbordas (@ignissak)
+ */
+public class ExpansionsLoadedEvent extends Event {
+
+    @NotNull
+    private static final HandlerList HANDLERS = new HandlerList();
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLERS;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLERS;
+    }
+}