bnc#822341: PPTX export of embedded text documents

-Make embedded text documents exported by analogy with spreadsheet
embedded documents.
-Convert MS ole objects to LO sepcific objecst to allow
exporting those ole objects too.

Plus use gb_CppunitTest_use_rdb instead of wasting time on
finding out which missing components cause test failing.
Especcially when we have platform dependent components
(e.g. related to embedded object)

Change-Id: Ic76d659b51274777a1669c215344a1169ebcba81
bnc#862510: PPTX import: Wrong text color inside shape

When theme index is 0, it means it's unset so we should not
apply that.

Change-Id: I62a9cd2a9b4c19f5acffc334d5e8263fe24fc8fd
bnc#862510: PPTX import: Wrong text vertical adjustment inside shape.

When alignment is not specified, it should be set to the
default "left" value just on time, when properties are
pushed to the property set, otherwise uninitialized value
is better.

Change-Id: Ic294c5d7cc477f7515aea1c071ad9b67275c012d