* Refactors DirectoryPreference from PLaylistPreference.
Adds editor to PreferenceEditor for directories.
Organizes preference editor tree.
* Adds recording directory preference to editor and updates recording
manager to dynamically use this property for recordings.
* Adds event logs directory preference to editor and updates event log
manager to dynamically use this property for event logging.
* Adds application log directory preference. Updates logging to use user
preference for application log directory. Moves logging initialization
into the main application class and removes file based logging configs
from the logback.xml configuration file.
* Refactors application logging into its own class and adds prefeence
update monitoring to dynamically stop/start the logger in the new
directory location.
* Adds streaming and screen capture directories to the user preferences
editor and updates streaming and screen captures to dynamically adapt
to user changes.
