Handle CGAL exceptions and add tests for mesh boolean operations

Add conversion to exact predicates exact construction kernel format for consecutive booleans (experiments)

tests/libslic3r/CMakeLists.txt

@@ -12,6 +12,7 @@ add_executable(${_TEST_NAME}_tests
 	test_polygon.cpp
 	test_stl.cpp
         test_meshsimplify.cpp
+        test_meshboolean.cpp
 	)
 
 if (TARGET OpenVDB::openvdb)