gnucash stable: Multiple changes pushed

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5591660f (commit)
	 via  https://github.com/Gnucash/gnucash/commit/f0bc6754 (commit)
	from  https://github.com/Gnucash/gnucash/commit/e0b5c0f5 (commit)



commit 5591660fcefd7844e785e15d4a142c7889b3b4fb
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Dec 30 12:58:40 2023 +0800

    [invoice.scm] centralize layout components into layout-key-list
    
    instead of maintaining 2 assoc lists.

commit f0bc6754b694d74d3c28a99ed03460304d952b89
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Sat Dec 30 12:47:39 2023 +0800

    [invoice.scm] normalize header section generators
    
    change the functions to require 1 options argument only



Summary of changes:
 gnucash/report/reports/standard/invoice.scm | 106 +++++++++++++++++-----------
 1 file changed, 66 insertions(+), 40 deletions(-)