toastergui: update layer search criteria

toastergui: update layer search criteria

In order to accomodate the designs around imported layer,
we add a "project" field for in the layer versions.

The field must be set if and only if the layer is manually
imported in the project. This will prevent information leakage
between different projects.

The views have been updated to perform relevant layer queries
in a single location.

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>