Add a new DatabaseContext class to manage driver behaviour externally + add a new query_direct method that skips all preprocessing + make all the schema related functions run through query_direct.

preprocessQuery cache now directly consumes Wincache + replace escapeTable cache for a static cache + escaping global temporary tables was not working.

Issue #2483515: Column names are not escaped when creating computed indexes for unique keys, leading to failed unique key creation when one of the participating columns is a reserved word.

Issue #2483515: Table creation silently fails if index creation fails due behaviour change for transactions in buffered queries.

Fix InsertQuery returning wrong serial value after inserts on high concurrent scenarios. Switch from lastInsertId() to OUTPUT.

Autoexpand fields into GROUP BY (with test) + fix warnings in tableHasXmlIndex() + Fix bug in cross join expression expansion.

Add XML storage support + Automatically deal with INDEX size limits (only in Primary Keys at the moment) by expanding/compressing Primary Keys on demand + Try to boot lock backend in fastache if possible + Do not exclude non affected rows in updates + Improve schema introspection + Allow addExpression() to explicitly set expressions that should not be expanded to cross joins + ....

Add support for XML storage and indexes + Override addExpression() to allow expressions that will not be added to the select list + Properly introspect fields when using the 'all_fields' option + improve aggreate detecttion + Do not remove expressions from Count queries if they are being used in conditions

Issue #2453947: Each GROUP BY expression must contain at least one column that is not an outer reference

Allow fastcache to work statically when no storage is available + fix cache_clear_all not working + fix tableExists() wrong cache behaviour.