✨ 完成 #3997

顺便把教学文件也改了……
Discussion: #4002

Plain Craft Launcher 2/Modules/ModEvent.vb

@@ -43,6 +43,7 @@
                                 End Sub)
 
                 Case "启动游戏"
+                    If Data(0) = "$mcv" Then Data(0) = McVersionCurrent.Name
                     If McLaunchStart(New McLaunchOptions With
                                      {.ServerIp = If(Data.Length >= 2, Data(1), Nothing), .Version = New McVersion(Data(0))}) Then
                         Hint("正在启动 " & Data(0) & "……")

Plain Craft Launcher 2/Modules/ModMain.vb

@@ -665,6 +665,7 @@ NextFile:
         Dim Result = Xaml.Replace("{path}", EscapeXML(Path))
         Result = RegexReplaceEach(Result, Function() EscapeXML(PageOtherTest.GetRandomHint()), "\{hint\}")
         Result = RegexReplaceEach(Result, Function() EscapeXML(PageOtherTest.GetRandomCave()), "\{cave\}")
+        Result = Result.Replace("{mcv}", "$mcv") '不知道为啥，实例化 {mcv} 有可能会炸掉，只能先把它换掉，再换成版本名
         Return Result
     End Function