* Force system text json for IJSonSerializer
* Migrate ColorPickerValueConverter
* Move ColorPickerValueConverter
* Clean up ColorPickerValueConverter
* Remove obsoleted property editors
* Migrate FlexibleDropdownPropertyValueConverter to System.Text.Json
* Use IJsonSerializer instead and move the value converter to Core
* Migrate ImageCropperValueConverter to System.Text.Json
* Inject jsonserializer in test and obsolete old constructor
* Migrate JsonValueConverter to System.Text.Json
* Remove ContextualConfigurationEditorJsonSerializer
* Remove JsonNetSerializer
* Remove obsolete DeserializeSubset from JsonSerializer interface
* Fix FlexibleDropdownPropertyValueConverter
* Update test JSON to be actual valid json
* Update more test json
* Update time format to be valid
* Add JsonPropertyName to models
* Update language models to get and set manual name
* Save custom language name in controller
* Rewrite AngularJS language edit view and controller
* Cleanup language overview
* Remove icon from language overview
* Make styling of control group the same as properties
* Ensure both ISO code and culture name are set in language model
* Use new language model constructor
* Update tests to use new language constructor
* Update culture name in dictionary package export
* Use language name in dictionary
* Fix language nullability issues
* Cleanup GetAllCultures and added null checks
* Re-add obsolete constructors
* Make language name required and update Cypress test
* Fix routing/saveNewLanguages Cypress test
* Make language name optional (improved backwards compatibility)
Co-authored-by: Ronald Barendse <ronald@panoramastudios.nl>
