Use std.traits.getSymbolsByUDA to access members of instance.

[Jonathan]

I can use `std.traits.getSymbolsByUDA` to get all the members of 
a class that have a particular UDA `getSymbolsByUDA(ValueType, 
UDA)`.

But how do I get the values with it?

Is there a more convenient way than `__traits(getMember, value, 
getSymbolsByUDA(ValueType, UDA)[0].stringof)`?