First public release

This release implements a basic API for interacting with datacube and xarray, including the following features:

• basic database connection (see ?odcr::database)
• datacube core Datacube class methods (see ?odcr::datacube)
• datacube core data discovery methods (see ?odcr::datacube
• datacube core data loading methods (see ?odcr::datacube
• xarray xarray.core.dataarray.DataArray class and formal S3 definition
• xarray xarray.core.dataset.Dataset class and formal S3 definition
• xarray native S3 methods for retrieving dimensions (see ?odcr::dim)
• xarray native S3 methods for indexing by arbitrary number of dimensions (see ?odcr::Extract)
• xarray native S3 methods for indexing by variable (see ?odcr::Extract)
• xarray native S3 methods for indexing by time strings (see ?odcr::Extract)
• xarray native S3 methods for arithmetic operators (see ?odcr::Arithmetic)
• xarray native S3 methods for coercing to native spatial classes raster* and stars (see ?odcr::as)
• xarray native S3 methods for plotting (see ?odcr::plot)
• configuration (see ?odcr::config)