sw: use new bookmark API in lcl_FillBookmarkArray() for text nodes
sw: use new bookmark API in lcl_FillBookmarkArray() for text nodes

For a document of 1000 pages and having 13000 bookmarks, this helps a
lot on ODF export: 2m51.565s -> 2m23.412s on my machine.

Change-Id: I8c8a7cd2b83a94ab7f2de17e0b4cb449fc4c0e1a

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core