Add ability to "interact" with Admin on module install/uninstall

[zyspec]

Enhancement -

Would like the ability for the module install/uninstall process to include the ability to interact with the Admin. There are instances where the install/uninstall could be enhanced by allowing the Admin to pick/choose a path through the process to optimize features.

An example of an uninstall process that would enhance the experience is to ask the Admin if they want to keep any uploaded files on the server or delete them. Currently the module developer has to decide how to handle this during module creation. It would be much better to let the Admin decide if they want to keep file(s), image(s), etc. associated with the module or to just delete them.