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So its type matches with what sqlite_bind_* functions expect

when fetching lists of albums. This will ease up sharing sorting code

So we can use File.is_present and to simplify integration of Sorting
for search results

This has the extra benefits of reducing our use of Media.is_present

Fix #34

To be able to specify the foreign key relationship on all subsequently
created tables

Instead of potentially using a thumbnail from an album the artist is
only featuring on

Since it will soon also allow to change the Origin field

To help when a const reference is needed as the return value.

This will be used by all classes using the Thumbnail class