uSync v19.0.0-beta01 and v17.5.1

Repo: KevinJump/uSync

Released uSync v19.0.0-beta01 for Umbraco 19.0.0-beta1 on .NET 11, on NuGet and npm as @jumoo/usync (next-19)
v19: ported to Umbraco 19.0.0-beta1 and net11.0, with cookie auth for SignalR and the uSync API
v19: uSync opens in its own Synchronisation section by default, Admins get the section on first boot
v19: copying a legacy folder can migrate Multi Node Tree Pickers, single media pickers and single dropdowns to the new v19 editors
v19: pre-v19 data type config imports the way Umbraco 19 migrates it, plus mappers for the new picker editors
v19: imports run as the requesting or background user, content is saved as the file's writer or the importing user
v19: segment values sync as culture overrides, schedules keep their invariant-for-variant flag, library elements in blocks count as dependencies, blueprint move and folder fixes
v19: removed everything marked obsolete for v18 and v19
v17/v18: member type compositions import, blueprint folder names keep their spaces
Released uSync v17.5.1
All branches: PRs get labelled with the release they'll ship in