pfSense

Update the Copyright year of the files owned by Rubicon/Netgate.

Update the Copyright year.

A subsequent commit will deal with .po's.

Add product_label global variable

Introduce product_label global variable, by default with same value of
product_name. The idea is to make it easier for rebranded products to
change the name on all visual texts while internal structures are
preserved.

While here, remove deprecated $g['platform'] and also replace places...

Update repository info before checking for updates

This is 2020. Issue #9245

Fix copyright message years to reflect BSDP -> ESF -> Netgate

Normalize some copyright messages

Update the Copyright notice for pfSense.

Make sure pfSense-upgrade return code is obtained instead of tail's one

Consider only last output line

Save pkg update return code

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