Legacy modX.getFullTableName: useful when dealing with Evo migrations or prefixed database tables without an xPDO model.
Add back Legacy modX.getFullTableName() method

Merge remote-tracking branch 'origin/pr/11333' into pr/11333

* origin/pr/11333:
  Legacy modX.getFullTableName: useful when dealing with Evo migrations or prefixed database tables without an xPDO model.