liblo: We need to provide LibreOffice with fake command line args too.

Change-Id: I34f364e63f814921bfe88af7cdf4ff4cdf6745fa
liblo: new saveAsWithOptions function

To not break API compatibility of libLO, add a new saveAsWithOptions
function and revert the old saveAs to initial state.

Change-Id: If245c0261a932b6ed5d65e20cb1b6d8bd1c50ce6
liblo: Return early everywhere where we potentially export images.

To avoid searching the node(s).

Change-Id: I1ddf962113ead192435c174ff3bf607596e4bfc3