Additionally adapted EscherPropertyContainer's AddOpt
methods to be more safe and flexible. Added support for
SvMemoryStream. Changed Data handling in EscherPropSortStruct
to use std::vector<sal_uInt8>, adapted all usages and
converions throgh all modules. This makes memorty handling
for these parts much safer (no more local new-ops, no
longer delete[] there).
Currently there are quite some usages of nProp.size() and
&nProp[0] to access the data. but the base for further
changes to work more on std::vector is done.

Change-Id: I982225c5bfc06fdd9e195d18cd3c550d15f1d48d
Reviewed-on: https://gerrit.libreoffice.org/57061
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>