Implementation of TrAnchor and TrOpacity.

[RocketTree]

Looks like setting the anchor and opacity properties are not implemented. I can see in the c api implementation they are explicitly not supported, so I guess that is also for the c++ api as well.

Having anchor implemented could be useful, but opacity can easily be worked around during later compositing.

To replicate load and animation and set either animation->setValue< rlottie::Property::TrAnchor >(... or animation->setValue< rlottie::Property::TrOpacity >(...

If you do not plan on implementing these then perhaps at least a note in the enum documentation that these are not supported.

Thanks.

[smohantty]

We tried to add the dynamic property change (similar to airbnb API) as there was no real usecase didn't implement all the properties . you are right the opacity implementation should be trivial.
If you are interested can raise a patch for the same :)