[WIP] Added support for alter table, foreign keys and autoincrement detection to Sqlite platform and schema

DBAL-392 Moving entity relationship doesn't move foreign key in mysql table

Fix for decimal fields with precision.

DBAL-398: Do not treat assignment operator as a parameter

Fix for DBAL-172

DBAL-200 Missing docs for 1 parameter in Connection::update

Update links in Readme

Fixed SQL Server Platform NULL declaration

Problem with sequence names, PostgreSQL and MixedCased schemas

Fix creating indexes for renamed columns and updating foreign keys for renamed parent tables in SqlitePlatform

Changed default flags (create indexes and create foreign keys) in SqlitePlatform::getCreateTableSQL method

fixed typo for enabling DEFERRED support

[DBAL-374] Fix issue with column quoting in primary keys, fixing this in indexes in general is much more complex as the code is messy.

Fix SQLServerPlatform adds unique constraint to ADD PRIMARY KEY statement