Forward compatibility for Gaffer 0.59's Attributes.extraAttributes
#4049
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This adds the forwards compatibility in Gaffer 0.58, for the changes that #4047 makes in Gaffer 0.59. The type of changes in
TypedObjectPlug.cpp
are not something I would normally entertain, but there was a limit to what could be achieved in the more usual startup compatibility shim. I think this is OK, because the TypedObjectPlug changes will be very short-lived : I will remove them as soon as we merge forwards to the master branch.