Merge Sharpino.Core into Sharpino making it just one library

[tonyx]

There are two projects with different nuget packages.
Sharpino and Sharpino.Core
This is not needed and add complexity in management.
We need to make it a single project
Just Sharpino.

1. Eliminate Sharpino.Core as a project.
2. Eliminate the reference to the external lib Sharpino.Core from Sharpino
3. The Sharpino.Core will just become a subdirectory of Sharpino.
4. The single files of Sharpino.Core will be referenced by Sharpino.
5. Consider wisely the order of inclusion. General rule must be: all the former Sharpino.Core files will preceedes all the current Sharpino files in the same order
6. Take a look at the Fable references that and at the "Entity" object type. Confirm that thet are not needed and remove them safely.