0026462: Visualization - selection does not adapt to line width change

0026462: Visualization - selection does not adapt to line width change

- added interface for changing sensitivity of a particular selection through both interactive and local context;
- added corresponding methods for changing sensitivity to SelectMgr_SelectionManager, SelectMgr_Selection and SelectBasics_SensitiveEntity;
- option -setSensitivity was implemented in vaspects Draw command;
- test case for issue #26462