LazReport: Implements DefExportFilterClass and DefExportFilterName
To be used in ExportTo method, if provided and not specific filter class
provided default filter class will be used.
CairoCanvas: fix dash patterns, fix line width and DoLineTo
LazReport, editor sample: implements export like last time, load&save
config to store last user report and export filter data
LazReport, updated roundrect report tester
CairoExport: scale, pen width, crash on direct export, frame drawing twice
Lazreport, don't debug printer info