Should use apcu_* instead of apc_* if available

[layanto]

Since PHP5.5+ with its included OpCache, APC (opcache+userland cache) is no longer used. APCu is used instead. APCu is basically APC with opcache part removed. For PHP5.5 and PHP5.6, APCu included APC backward compatibility functions where all apc_* functions (eg apc_fetch) will internally call apcu_* functions. With PHP7, APC backward compatibility feature is no longer included/enabled by default. As such apc_* functions no longer work.
Any chance of adding NotORM_Cache_APCu class to Cache.php where apc_fetch and apc_store are replaced with apcu_fetch and apcu_store respectively?

[layanto]

Or add to NotORM_Cache_APC class to selectively use apcu_* if available and fallback on apc_* if not.