connection: cleanup errored if more than 5 available

This should reduce the big on disconnect memory leak. Not ideal still, but way better.

src/main/java/de/bixilon/minosoft/protocol/network/connection/play/PlayConnection.kt

@@ -119,6 +119,7 @@ class PlayConnection(
         this::error.observe(this) {
             if (errored || it == null) return@observe
             ERRORED_CONNECTIONS += this
+            cleanupErrors()
             state = PlayConnectionStates.ERROR
             error.report()
             errored = true
@@ -274,5 +275,12 @@ class PlayConnection(
 
             return result.toTypedArray()
         }
+
+        private fun cleanupErrors() {
+            while (ERRORED_CONNECTIONS.size > 5) {
+                // we just keep 5 connections here, they are for crash reports
+                ERRORED_CONNECTIONS.iterator().remove()
+            }
+        }
     }
 }