v1.18.0-rc.1

Bugfixes:

- #7708: irreversible Local Additions after re-adding the same folder as Receive Only

Enhancements:

- #7700: Add rest endpoint(s) to dismiss pending folder/device invitations
- #7722: Database GC can block for a long time
- #7724: Ensure encryption to untrusted on new, trusted device on an existing folder
- #7742: Use defaults for missing fields on the config rest API
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