Extract ExceptionInEventChannelFilterException to separate file

mirai-core-api/src/commonMain/kotlin/event/EventChannel.kt

@@ -30,22 +30,6 @@ import kotlin.coroutines.suspendCoroutine
 import kotlin.internal.LowPriorityInOverloadResolution
 import kotlin.reflect.KClass
 
-/**
- * 包装 [EventChannel.filter] 的 `filter` lambda 抛出的异常并重新抛出.
- */
-public class ExceptionInEventChannelFilterException(
-    /**
-     * 当时正在处理的事件
-     */
-    public val event: Event,
-    public val eventChannel: EventChannel<*>,
-    override val message: String = "Exception in EventHandler",
-    /**
-     * 原异常
-     */
-    override val cause: Throwable
-) : IllegalStateException()
-
 /**
  * 在此 [CoroutineScope] 下创建一个监听所有事件的 [EventChannel]. 相当于 `GlobalEventChannel.parentScope(this).context(coroutineContext)`.
  *

mirai-core-api/src/commonMain/kotlin/event/ExceptionInEventChannelFilterException.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2019-2020 Mamoe Technologies and contributors.
+ *
+ *  此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ *  Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ *  https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.event
+
+/**
+ * 包装 [EventChannel.filter] 的 `filter` lambda 抛出的异常并重新抛出.
+ *
+ * @see EventChannel.filter
+ */
+public class ExceptionInEventChannelFilterException(
+    /**
+     * 当时正在处理的事件
+     */
+    public val event: Event,
+    public val eventChannel: EventChannel<*>,
+    override val message: String = "Exception in EventHandler",
+    /**
+     * 原异常
+     */
+    override val cause: Throwable
+) : IllegalStateException()