Support functionality

[pjljvandelaar]

I would like to have support functionality that is needed in many analysis and transformations.

For example,

• Is a package already included (with X;)?
• Are items of a package already available in the name space (use X;)?

With these two functions you can make complicated queries & transformations like

• How should I refer to Y of package X? X.Y or Y?
• Add dependency to X when needed (i.e. not already included).

Finally, I would like rename functionality that can be part of a larger transformation.
Yet, we might be able to use the implementation that is already available in GNATStudio.
However, we can't do a file by file analysis anymore, since a rename can be scattered over many files.