Upgrade to Dynamo 2.0 and UI simplifications

Added

• Abstract JsonOptionsBase class inheriting from NodeModel, providing a reusable UI for nodes requiring JsonOption and Nesting options.
• Change log.
• Support for Dynamo Dictionaries (DesignScript.Builtin.Dictionary).

Changed

• Transition to Dynamo 2.0.
• Previous Zero Touch nodes that have been replaced by NodeModels are set as static and hidden on Dynamo library.

Removed

• JsonArray class.
• Dropdown node for JsonOption selector.
• jsonOption and nested inputs on nodes requiring these options.

Known issues

• Public JsonOption enum loaded and visible to Dynamo Library. This is a known issue on Dynamo 2.0. Once fixed, JsonOption nodes will be hidden.