v1.15.0-rc.3

This release updates the CLI to use subcommands and adds the subcommands
`cli` (previously standalone `stcli` utility) and `decrypt` (for offline
verifying and decrypting encrypted folders).

With this release we invite everyone to test the "untrusted (encrypted)
devices" feature. You should not use it yet on important production
data. Thus UI controls are hidden behind a feature flag. For more
information, visit:
https://forum.syncthing.net/t/testing-untrusted-encrypted-devices/16470

Bugfixes:

- #7419: panic "Snapshot(): database is closed" on start after wiping database
- #7429: "Ignore Patterns" tab disappears after visiting "Folder Defaults"

Enhancements:

- #6566: Ship stcli in main package

Other issues:

- #4719: Package stcli as Debian package
- #7199: Build script -no-upgrade handling is unintuitive
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