Fully support escaped qualified names in module rename

[toinehartman]

Describe the bug

When moving a module file, a rename of related qualified names is triggered. This does not take into account unnecessarily escaped references to the module name, like \foo::Bar.

This should be supported.

Related to #838.

Expected behavior
All references should be properly renamed (i.e. the renaming should not result in static errors).

Desktop (please complete the following information):

• Context: VS Code extension