v2.0.0

• Update extractors to align to the latest interfaces in tatami.
• Improved sparse extraction on the secondary dimension with some judicious caching.
• Improved primary sparse extraction of non-zero values by more carefully constructing hyperslabs.
• Renamed classes and functions to remove the "HDF5" component, as this is redundant with the name of this library. For example, we now have just DenseMatrix and CompressedSparseMatrix, sans the Hdf5* prefix.
• CSR/CSC layout and transposition status are now constructor arguments. This is more ergonomic for users who don't know the layout of their data at compile time.