pfSense

Fix comparisons for CDATA tags in config

Some length numbers here do not match the strings they are comparing with. That looks very odd.
Note that:
```
substr($ent, 0, 5) == "text"
```
will return true when $ent is "text". So actually this "works". But it returns false if $ent is "text1" "texta" etc....

Fixed #6893
Null configuration settings are now written as <tag></tag> instead of <tag /> for consistency

Move copyright from ESF to Netgate

Move to Apache License 2.0

Review license / copyright on all files (final round)

Review license / copyright on all files (1st round)

Merge pull request #3037 from NOYB/Check_IP_Services

Check IP Services

Configurable check IP services.
Used by Dynamic DNS services to check IP addresses.
Configure as many check IP services as desired. The first (highest in the list) that is enabled will be used as the default.
A future possibility could be to add an option to the Dynamic DNS entires to use a specific check IP service....

Remove duplicate listtags() entry 'member'.

Fixed #6174

Update license on files from /etc/inc

etc inc delete $Id comments

and bits of white space.
Note: There are plenty of files still with old-format copyright sections
in here.

Move main pfSense content to src/