API client class 2.0.1

• main change is the introduction of Exceptions for improved error handling
• removed usages of the PHP trigger_error() function
• several other minor changes
• added an example of Exception handling to the README
• updated the examples/list_alarms.php file to demonstrate Exception handling

Important note

Use this first release in the new 2.X branch with care, it has not yet been tested in live production environments!

PS: the previous release, 2.0.0 was accidentally based on the main branch, that is now fixed with this release.