[DBAL-220] Add support for Index flags and implement support for SQL Server CLUSTERED/NONCLUSTERED and MySQL FULLTEXT.

[DBAL-216] Add Sqlsrv as driver

This is necessary because pdo_sqlsrv still has some little bugs that
prevent it from being used in all use-cases. Additionally only sqlsrv
can make use of the Azure federations features.

[DBAL-211] Fix bug with elements in default schema not filtered for really being in the default search path.

Revert a previous commit, apparently the Type engine has two ways of naming types, and there is one that is case-sensitive.

Mysqli: Fixed that we never used provided type.

Added keywards to drizzle platform.

Convert boolean values properly for default value declarations

DBAL 205 Fix

[WIP] Drizzle Support

Fix DBAL-196

Unique key name isn't correctly set - DDC-1603

[DBAL-206] OraclePlatform causes problems with more schemas with same table names