Multiplatform Exceptions to deal with kotlin bug

mirai-core/src/androidMain/kotlin/net/mamoe/mirai/contact/PermissionDeniedException.kt

+package net.mamoe.mirai.contact
+
+/**
+ * 权限不足
+ */
+actual class PermissionDeniedException : IllegalStateException {
+    actual constructor() : super("Permission denied")
+    actual constructor(message: String?) : super(message)
+}
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mirai-core/src/androidMain/kotlin/net/mamoe/mirai/event/events/EventCancelledException.kt

+package net.mamoe.mirai.event.events
+
+@Suppress("unused")
+actual class EventCancelledException : RuntimeException {
+    actual constructor() : super()
+    actual constructor(message: String?) : super(message)
+    actual constructor(message: String?, cause: Throwable?) : super(message, cause)
+    actual constructor(cause: Throwable?) : super(cause)
+}
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mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/contact/PermissionDeniedException.kt

+package net.mamoe.mirai.contact
+
+/**
+ * 权限不足
+ */ // 不要删除多平台结构
+actual class PermissionDeniedException : IllegalStateException {
+    actual constructor() : super("Permission denied")
+    actual constructor(message: String?) : super(message)
+}
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mirai-core/src/jvmMain/kotlin/net/mamoe/mirai/event/events/EventCancelledException.kt

+package net.mamoe.mirai.event.events
+
+
+// 不要删除跨平台结构.
+// 否则在 Java 中这个 class 不会被认为是 java.lang.RuntimeException (Kotlin bug)
+@Suppress("unused")
+actual class EventCancelledException : RuntimeException {
+    actual constructor() : super()
+    actual constructor(message: String?) : super(message)
+    actual constructor(message: String?, cause: Throwable?) : super(message, cause)
+    actual constructor(cause: Throwable?) : super(cause)
+}
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