[CHG] remove usage of use statement in ext_tables/localconf

Use namespace classes without usage of "use" statements in ext_tables and ext_localconf

because ext_tables and ext_localconf are merged by TYPO3 it's easy to have more than one use statement on the same class with the same name, which results in an error in php. By using the full namespaced class path we get around that. Also all deprecated calls in ext_tables and ext_localconf are changed to new classes