This accumulates all calls to OutputDevice::ImplRefreshAllFontData
while loading document's model, to avoid multiple updates for each
imported font. After loading, OutputDevice::ImplRefreshAllFontData
is executed once.

Change-Id: I5b23a2b8a3765dee9061b6479665d04c2ba11cbf
Reviewed-on: https://gerrit.libreoffice.org/47112
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>