Add missing project files - System.M* System.R*

[gewarren]

Contributes to #7707.

Adds 336 C# project files.

[opbld31]

Docs Build status updates of commit 00d7ee0:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System.Media/SoundPlayer/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Media/SoundPlayer/PlaySync/Project.csproj	✅Succeeded
snippets/csharp/System.Media/SystemSound/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/AcknowledgeTypes/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/BinaryMessageFormatter/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/DefaultPropertiesToSend/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/Message/.ctor/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/Message/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageEnumerator/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessagePropertyFilter/.ctor/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/Close/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/Delete/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/GetAllMessages/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/GetPrivateQueuesByMachine/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/MessageReadPropertyFilter/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueue/ReceiveCompleted/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueuePermission/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueuePermissionAccess/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueuePermissionAttribute/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueuePermissionEntry/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Messaging/MessageQueuePermissionEntryCollection/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/AssemblyBuilder/AddResourceFile/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/AssemblyBuilder/DefineDynamicModule/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/AssemblyBuilder/DefineResource/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/AssemblyBuilder/Save/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/AddDeclarativeSecurity/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/GetModule/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/Name/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/SetImplementationFlags/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ConstructorBuilder/SetSymCustomAttribute/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/CustomAttributeBuilder/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/DynamicMethod/.ctor/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/DynamicMethod/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/EnumBuilder/Assembly/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/EnumBuilder/GUID/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/EnumBuilder/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/FieldBuilder/Attributes/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/FieldBuilder/SetCustomAttribute/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/FieldBuilder/SetMarshal/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/GenericTypeParameterBuilder/MakeArrayType/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/GenericTypeParameterBuilder/Overview/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/BeginCatchBlock/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/BeginFaultBlock/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/BeginFinallyBlock/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/BeginScope/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/DeclareLocal/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/DefineLabel/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/Emit/Project.csproj	✅Succeeded
snippets/csharp/System.Reflection.Emit/ILGenerator/EmitCall/Project.csproj	✅Succeeded

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[BillWagner]

This also looks great. I'll now.