`NameFactory` now supports extra args and kwargs for constructor
`ONLY` table factory for `Table` instances with `ONLY=True` (render as "ONLY tablename")
dropped table wrapping support
=> `.FROM('string_tablename', AS='alias', ONLY=True)` no longer supported, only `.FROM(ONLY.tablename.AS('alias'))`
`Identifier.name` attribute renamed to `Identifier._name` to reduce chance of name clashes with sub-identifiers
identifiers and tables no longer allow attribute assignment
+ name factories no longer care about attribute deletion
dummy variables no longer render as sql literal, but just as a `$varname` representation
fixed bug introduced by the drop of `.FROM('table_name_as_string', AS=..., ONLY=...)` syntax
import loop fixes
added missing imports needed for table to field transition