pfSense

Rework pkg_mgr_install.php:

- Stop using id parameter for additional packages, keep using it only
for firmware upgrades
- Created to control variables $completed and $confirmed to check all
the stages and make it easy to understand what is happening
- Stop using $pkgid and use $pkgname instead
- Set $pkgname early and validate the port name
- Use $firmwareupdate everywhere to check if it's a firmware upgrade
- Add hidden input called confirmed to control when user has confirmed
installation / upgrade / removal
- Add specific messages for reinstall all
- Remove an extra form submit and just changes progress bar and
informative panel when json process finished successfully