sd html: export outline, code simplification

Change-Id: Ic201f4bd7716806edd031a2935d1e859a6b51958
sd html: impress html export test

Change-Id: I710868b4cb19cec2820c3cf699dd5d855e3da7e2
sd html export: reset progress bar in single document mode

Change-Id: I455588c927cc35660023f74885f63108625cd123
sd html export: q&d add single document publish mode

Change-Id: Ifa96814eb2664bea082e51bfaa739250718abd1e
fdo#74079 - sd html export: fix false width values

Change-Id: I498310525cf912706d64adb773c951b197b6fc72