v1.16.0-rc.3

This release adds untrusted / encrypted devices for public testing. It
should still be considered beta / testing-only.

Bugfixes:

- #7026: panic: key not found when repairing DB
- #7379: "Warning, this path is a subdirectory of an existing folder" does not appear when editing only folder label
- #7533: Remote completion on untrusted devices is incorrect
- #7548: Upgrading syncthing-relaysrv to 1.15.0 fails in post-installation
- #7551: QUIC: failed to determine receive buffer size: doesn't have a SyscallConn
- #7557: Encrypted folder(s) on Windows reported as "Unexpected Objects"
- #7568: panic: runtime error: slice bounds out of range [24:3]
- #7584: Folder label missing from folder path when adding new folders

Enhancements:

- #109: Support for file encryption (e.g. non-trusted servers)
- #3322: GUI "Out of sync" modal uses massive amounts of CPU in browser
- #7520: Ask for confirmation before reverting/overriding a folder
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