fdo#58307: Export sheet tab colors to xlsx.

And let's not re-use Biff's XclExpWsbool record class to export <SheetPr>
elements.  That was a bit hacky...

(cherry picked from commit 5063f31c248fd3c16115582a1e3aef182257a225)

Conflicts:
	sc/source/filter/excel/excrecds.cxx
	sc/source/filter/inc/excrecds.hxx

Change-Id: Ia585f53d547af3d6840fce1b1244b60bb5076b07
Reviewed-on: https://gerrit.libreoffice.org/8583
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>