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Fix #47

refs #29

Bypass those tables and directly propagate the presence state in the
media

Reparse them instead of deleting/re-adding them. This allows us to keep
any potential meta information set by the user on the reloaded media

Since this type is also meant to be public

This allows a reference to be returned (without wrapping all subitems in
a unique_ptr or a reference_wrapper, or a manually heap allocated Item*)

Incidentally, this fixes a missing file_id update when associating a
file with a playlist

Delegate subitem creation to the parent item. This way we can access the
internals of the parent item upon creation, and the item is created in
place.
This will also ease up privatization of the Item type, since we don't
want it to be publicly available for creation

Prepare all entities and re-initialize the item. This way we can get rid
of some unused setters

This is solely replacing direct members access with a pair of
getters/setters

This works now but is bound to fail at some point

Comparing for equality doesn't work anymore since we removed a Task.
Simply check that all expected steps have been completed, regardless of
another task being completed as well.

We now fallback to starting a playback early, no need for the old
complicated and full of special case code