Clean up quoting algorithms in the database dialects

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This is something that should get removed in the future.

ValueMeta : split up in different classes

Create a factory ValueMeta.createValue("name", "String") etc. so that we can support pluggable data types, smaller classes, cleaner code etc.  It will be a challenge to keep the changes minimal.

Example for a use case using milliseconds: http://jira.pentaho.com/browse/PDI-7103

Remove shared objects from TransMeta, JobMeta

Mat Lowery asked the question why we still have List<DatabaseMeta> and so on in TransMeta, JobMeta.  

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