Change error messages to reflect new module terminology

Change error messages to reflect new module terminology

Previously, modules which registered types into a protected type
namespace were known as "strict" modules; now they are known as
"identified" modules.

This commit also adds a unit test to ensure that the module identifier
directive is the first command in the qmldir file.

Change-Id: I90e9d2c5b51ecb2b9d058c9fe9d9310fd3cd4f45
Reviewed-by: Matthew Vogt <matthew.vogt@nokia.com>
Reviewed-by: Bea Lam <bea.lam@nokia.com>