[Scesim Editor] Allow user to destinguish between dmn files in different packages

In VS Code user can create a package and add dmn file there.
If he got two packages and the dmn files with the same names in them
then he would not able to figure out what is what.

In BC during creation of new scesim file we got subtitle with full path

So two proposed solution:
1) To show package specific dmn files
2) To show every dmn with subtitle with full path