RM-38434: Exclude AWL headers

[brouwers-tiobe]

See RM-38434.

Defines the components of an AWL 'header' block (as defined in RM-38373), found at the start of the file. These are skipped in order to exclude them from duplication.

Example block that is skipped:

FUNCTION_BLOCK "fb1"
TITLE = %version: 1 % Title information is present here % $ ^ \
{ this_is_false := 'FALSE' }
FAMILY : Fam1
VERSION : 0.0

[brouwers-tiobe]

Build artifact: CPD

Tool	Download
CPD	CPD-0.0.1-278.zip

[zon-tiobe]

Reviewed and discussed offline.

The combination of the stricter header ordering and the broader function definition still excludes everything we want, and correctly includes things like titles outside headers as well.

After the explanation, the 'magic' of why this happens is now gone too. :)

LGTM!