Breaking changes in PureHDF

[Apollo3zehn]

Hi Lior,

I had to introduce at least two breaking changes to PureHDF in the latest update:

• many concrete types have been replaced by interfaces, e.g. H5Attribute is now IH5Attribute. Reason: I have introduced a virtual objet layer similar to what the HDF group did to their C implementation of HDF5. This was required to support access to files hosted in the cloud using the HDF group's HSDS service.
• The Attributes property does not exist anymore. It has been replaced by the Attributes() method. Reason: Properties do not work well with the async programming model. I.e. there is now also an AttributesAsync() method (which is not yet properly implemented, but will be in future).

I think you can adapt to these changes easily. If you encounter any problem, please contact me.

[LiorBanai]

Yeah I'll reflect those changes. Thanks for the update :)