Security rules prohibit use in .NET 4

[GoogleCodeExporter]

The Security-Transparent Code Level 2 rules in .NET 4 mean that any time we 
implement an interface member which has the SecurityCritical or 
SecuritySafeCritical attribute, we need to supply that attribute too.

Currently in some cases (I don't have details) we fail with:

> Inheritance security rules violated while overriding member: 
Instant.GetObjectData(System.Runtime.Serialization.SerializationInfo, 
System.Runtime.Serialization.StreamingContext)'. Security accessibility of the 
overriding method must match the security accessibility of the method being 
overriden.

Rather than just fix ISerializable, I'd like to add a unit test which checks 
*all* members of *all* interfaces implemented by *all* types. It shouldn't be 
too hard.

We might then want to consider applying this back to the 1.2 stream and doing a 
new release of it - or possibly doing a new 1.3 release.

References:

http://msdn.microsoft.com/en-us/library/dd233102(v=vs.100).aspx
http://stackoverflow.com/questions/3055792

Original issue reported on code.google.com by jonathan.skeet on 10 Mar 2014 at 6:35