- added intersect polygon with line as line, semi-line or segment mode - added polygon boolean operations using Clipper library
- added intersect polygon with line as line, semi-line or segment mode
- added polygon boolean operations using Clipper library

SearchAThing-old1/SearchAThing.Sci,devel0/SearchAThing.Sci,SearchAThing-old1/SearchAThing.Sci,devel0/SearchAThing.Sci