Changing /Allow_*Spacing_*Without_*Borders/I
       to AllowPaddingWithoutBorders

related to tdf#103275 where "spacing to contents" is to be changed to
Padding. Rename this already in LO53 to simplify potential backports
and laying other groundwork for fixing this bug.

Also, I can easily see setting AllowPaddingWithoutBorders globally in 5.3
for the purpose of being able to share documents when
the UI in LO5.4 permits creation of padding without borders.
Otherwise older versions will display significantly different formatting.

Change-Id: I253173274f824a019ebc09a039c471d170c1be73
Reviewed-on: https://gerrit.libreoffice.org/30372Reviewed-by: Justin Luth <justin_luth@sil.org>
Tested-by: Justin Luth <justin_luth@sil.org>