Improvements to existing features

• [LTI] Update to the APIs with LMS systems to comply with stricter requirements of Canvas

• [Exam Taker] Lower the threshold to detect the microphone by 3dB to make it easier for exam takers to trigger detection

Bug fixes

• [Admin] Fix an issue when creating a new exam and navigating back and forth between the various exam creation steps would break the forms, making it hard to submit the reviewer instructions.