Resolves: #i56084# added support for export selection in swf export

(cherry picked from commit 9cfa6464411e39e1cbaef8f0c7c64bddbed4033b)

Conflicts:
	filter/source/flash/swfexporter.cxx
	filter/source/flash/swfexporter.hxx
	filter/source/flash/swffilter.cxx

Change-Id: I987c43af54982daea532c8f4f915eb2bd91ea267