Add support for searching for alternate invocees for externs #129
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For certain C# methods, Udon exposes the method via a different type than Roslyn considers it to be defined on. One example is `System.Type.Name`, which is actually defined in `System.Reflection.MemberInfo`, but exposed via `System.Type.Name`. This change allows U# to locate these alternate extern symbols and use them transparently. We move the logic for checking whether symbols are exposed to udon down into BoundExternMethodInvocation, then teach this class to search declared interfaces and superclasses of the _invocation_ target (rather than the symbol's containing type) for defined externs. Note that we assume that any exposed extern will match if we find it via a constructed symbol here.
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For certain C# methods, Udon exposes the method via a different type than Roslyn considers it to be defined on. One example is
System.Type.Name, which is actually defined inSystem.Reflection.MemberInfo, but exposed viaSystem.Type.Name.This change allows U# to locate these alternate extern symbols and use them transparently. We move the logic for checking whether
symbols are exposed to udon down into BoundExternMethodInvocation, then teach this class to search declared interfaces and
superclasses of the invocation target (rather than the symbol's containing type) for defined externs.
Note that we assume that any exposed extern will match if we find it via a constructed symbol here.