Revert "added quoteidentifier for joins (and discriminators)"

This reverts commit dad7f446e947f974007c9c42b708c6d30aeee4a7.
Revert "added phpdoc"

This reverts commit 6339a9d3fe4fed3c0287d11357c4a7522520ec09.
Revert "fixed issue where join column name is not escaped by quotingstrategy"

This reverts commit 60696d887a835d5cd1a96323de99b2c4c8acdcd5.