Removed deprecated code marked in 5.0.x : oxSession::getVar

Removed function and usages
Removed deprecated code marked in 5.0.x : oxSession::getVar

Removed other usages
Removed deprecated code marked in 5.0.x : oxSession::deleteVar

Removed function and usages
Removed deprecated code marked in 5.0.x : oxShopMetaData::getInstance

Removed function and usages
Removed deprecated code marked in 5.0.x : oxUtils::getInstance

Removed function and usages
Removed deprecated code marked in 5.0.x : oxSession::getVar

Removed some usages in tests
Removed deprecated code marked in 5.0.x : oxSession::deleteVar

Removed usage in test