OSX: Added DeletePeakFilesWhenExceedingMaximumFolderSize to PeakFileService.
OSX: Refactoring and new features in sync services.

- SyncListernerService: Added API methods to return markers, loops and
equalizer presets.
- SyncClientService: Added methods to fetch markers, loops and equalizer
presets.
- SyncDeviceManagerService: Now publishing list of devices to
SyncDiscoveryService.
- SyncDiscoveryService: Refactored class to let consumers add devices to
search while the looper is running.