* Add new AcceptsHeader
add Parent field to Team
add ParentId field to NewTeam and UpdateTeam
update Create Edit and Delete Team methods to use preview header
* Implement new API call GetAllChildTeams()
* Implement GetAllChildTeams for ObservableClient
* add integration test for observable client
* Add pagination tests for GetAllChildTeams
* Add NestedTeams preview header to all the API calls that use it
* Update tests for accepts header
* Add accepts header to observable client calls
* Fix DELETE implementation to use correct overload
* Fix tests - parent and child teams must be visibility Closed whereas the default if not specified is Private
* make sure all tests are flagged as [OrganizationTest]
* Make sure Update tests change the parent of the team
* Update new methods with NesterTeams preview API header and adjust tests
* Fixup TeamContext helper name
* Implement overload for GetAllMembers to take request parameter
* Update tests
* Implement Obersvable client changes
* Observable tests
* Implement AddOrEditMembership function returning a new response model, and obsolete the old AddMembership function returning an enum
* Implement GetMembershipDetails function returning new TeamMembershipDetails response model, and obsolete the old GetMembership function returning an enum
* Clarify that an exception is thrown when not a member
* Add integration tests for AddOrEditMembership and GetMembershipDetails
* fixup exception test for observable client
* Update wording of obsolete message
* Add release notes and bump version to 0.24
* run "build FormatCode" to fix up whitespace/formatting issues
* Fix failing Ssh key tests due to "validation exception". This key must be in use on github (under another user, most likely from these tests failing). Changed to a new SSH key and tweaked tests to reduce chance of a key being created and not destroyed
* Assignee and Assignees cant both be specified on NewIssue. We missed this one in the PR. Marked Assignee as [Obsolete] and fixed tests to use Assignees
* Fix a couple of Reactions tests that were calling the wrong client methods
* Fix timeline tests - looks like the response class has changed shape a bit, it now has an Issue object in the payload and Id field isnt present (leaving Id field there in case other timeline events do use it)
* Fix some following tests that require the test user to follow more than 1 other user
* Unskip these Event tests now because apparently they work!
* add breaking changes notes
* Update ApiErrorMessageSafe to return null for empty and whitespace strings (#1540)
* return null if ApiError.Message is empty or whitespace
* Uncomment test, which now passes
* update release notes to include PR1540
* Add "Bot" AccountType, was causing a deserialization exception when running the integration test "SearchForExcludedLanguage" (#1541)
* Update to include PR1541
* add bullets to make release notes easier to read
* markup additional code mentions in notes
* Fix grammar
fields => field
