e_shims is an e107 v2-compatible class for the first namespaced core
class, e107\Shims\All.
e107\Shims\All is built from the e107\Shims\InternalShims trait.
e107\Shims\InternalShims currently implements a resilient replacement
for the PHP internal readfile(), which is needed by issue #3528.
As for how the new namespaced classes are handled, the e107 class
(e107_handlers/e107_class.php) has an updated e107::autoload() which
detects namespaced classes and goes to e107::autoload_namespaced().
Namespaced classes handled by e107 are in the \e107 top-level namespace,
and all sub-levels match directory paths under e_HANDLER.
