Ensure export includes installed layermanagers.
Migrate Praat integration token endpoint to nzilbb.labbcat.server
Use /api/keepalive instead of /keepalive
Migrate keepalive to API.
Migrate license agreement page to Angular.
Update jsendpraat to support form-based user auth.
Migrate tree to Angular.
Migrate seriesFiles to Angular: episode/documents
Migrate threads/thread pages to Angular, as tasks/task.