FreeNAS Code

Misc improvements.

Refactor update notification implementation. Use SQLite as database.

- Add separator in help menu.
- Modify firewall rules table header.

Code cleanup.

Fix rendering problem.

Rename 'Client firewall' to 'System firewall'. Update translation template file.

Import/export firewall rules as XML files.

Misc code improvements.

Modify firewall import process. Create new uuid and modify description of rule if it already exists. Add button to delete all rules.

Display firewall rule action via icon.