This extends the recently merged PR #5616, which expanded the Synching config to allow declarative settings under Linux, such that it also works under Darwin.
Changes:
* Update the module's `syncthing` launchd agent to copy the synching key/certificate before starting syncthing, analogously to the systemd service from the above mentioned PR #5616.
* Adds an `syncthing-init`launchd agent (analogously to the systemd service `synching-init` from the above mentioned PR #5616) that updates the configuration files. Since this must be run after the syncthing service started, we use a `WatchPath` to coordinate both launchd agents.
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