pfSense

Fix #7694: Replace sshlockout_pf by sshguard

Fix #8417

- Changed default value for Maximum Table Entries to 400000 in order to
make bogonsv6 to work
- Added code to upgrade config and set default value on systems where
it's not defined
- Changed default config to match new default and version 18.0...

Bump up the XML config version.

Bump up the default config.xml version.

Make sure pkg metadata is updated at least once daily. It will be used to speedup GUI parts related to pkg update

Revise default widget settings to accommodate new support widget name

Support widget visible by default

In a stock/default config.xml, show firewall rule descriptions in a column. Fixes #7323
Previous performance and display issues do not appear to be a problem any longer. See https://redmine.pfsense.org/issues/7323

Added control to set dashboard widget refresh period
Start each widget refresh system after a short random delay to prevent all widgets hitting the server at the exactsame time
Fix issues wherein two widgets were resetting the refresh timer from the AJAX call, not the call-back function, thereby risking stepping on themselves

Tweak upgrade - Remove unused code and document changes better

This will ensure a smooth upgrade for those running config 15.4 to any next version.