LazReport, Remember used last export filter class/filename and use them if ExportTo is called with empty parameters

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40987 4005530d-fff6-0310-9dd1-cebe43e6787f
LazReport, Editor sample, added some testing reports

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40988 4005530d-fff6-0310-9dd1-cebe43e6787f
LazReport, Editor sample, remember last exported report/export filter + repeat export button

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40989 4005530d-fff6-0310-9dd1-cebe43e6787f