feat(ModEvent): 支持一个按钮执行多个事件

没给 HelpEntry 加这个功能，其他控件都加了

Plain Craft Launcher 2/Controls/MyTextButton.vb

@@ -47,7 +47,7 @@
             IsMouseDown = False
             Log("[Control] 按下文本按钮：" & Text)
             RaiseEvent Click(Me, Nothing)
-            ModEvent.TryStartEvent(EventType, EventData)
+            ModEvent.ProcessCustomEvents(EventType, EventData, _CustomEvents)
             e.Handled = True
         End If
     End Sub
@@ -106,5 +106,17 @@
     End Property
     Public Shared ReadOnly EventDataProperty As DependencyProperty = DependencyProperty.Register(
         "EventData", GetType(String), GetType(MyTextButton), New PropertyMetadata(Nothing))
+    Public Property CustomEvents As CustomEventCollection
+        Get
+            If _CustomEvents Is Nothing Then
+                _CustomEvents = New CustomEventCollection
+            End If
+            Return _CustomEvents
+        End Get
+        Set(value As CustomEventCollection)
+            _CustomEvents = value
+        End Set
+    End Property
+    Private _CustomEvents As CustomEventCollection = Nothing
 
 End Class