Create an uninstall SQL script

[valadas]

We need to create an uninstall sql script if anyone want's to be able to remove the module without leaving data behind.

This involves 2 parts

1. The tables that were created by the module installer
2. The tables that were created dynamically by the system

For 1, we just have to create an Uninstal.SqlDataProvider (the goal of this issue

For 2, it would be very difficult right now but it should be easier once I have to time to work on this: dnnsoftware/Dnn.Platform#2160

[WillStrohl]

I just created issue #65 that could be indirectly impacted by this issue.