Updates with Poplar SDK 3.1 release

Updates with Poplar SDK 3.0 release

Updates with Poplar SDK 2.6 release

Updates with Poplar SDK 2.5 release

Further updates with Poplar SDK 2.4 release

Updates with Poplar SDK 2.3 release

README update

Updates with Poplar SDK 2.1 release.

Tutorials and simple code examples have been moved to a dedicated repository.