0024863: CLang warnings -Wint-to-void-pointer-cast

0024863: CLang warnings -Wint-to-void-pointer-cast

Warning was fixed.

Remarks were applied.

- class VMap in Draw was removed
- NCollection_DataMap is used to store objects
- name of object is used to associate Tcl variable with the object
- creation and changing of objects are correclty handled

Redundant casts were removed.

Initial value is restored if variable is protected.
Tests for bug #24863 were added.

Some test cases and tcl command "save" were improved.

Useless using of upvar was removed.