Make user mutable via CoreProtectPreLogEvent (#66)

* Make user mutable via CoreProtectPreLogEvent

* Cleanup & added missing toLowerCase in getId

* Docs: add Event category; add CoreProtectPreLogEvent

* Merged event documentation into API documentation

* Removed event.getUser() equality check

* Added IllegalArgumentException check within PreLogEvent

* Reverted docs/index.md

Co-authored-by: Intelli <contact@intelli.software>

src/main/java/net/coreprotect/event/CoreProtectPreLogEvent.java

@@ -0,0 +1,37 @@
+package net.coreprotect.event;
+
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+public class CoreProtectPreLogEvent extends Event {
+
+    private static final HandlerList handlers = new HandlerList();
+    private String user;
+
+    public CoreProtectPreLogEvent(String user) {
+        super(true); // async
+        this.user = user;
+    }
+
+    public String getUser() {
+        return user;
+    }
+
+    public void setUser(String newUser) {
+        if (newUser == null || newUser.isEmpty()) {
+            throw new IllegalArgumentException("Invalid user");
+        }
+
+        this.user = newUser;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}