We prefer to test across all platforms at once with
`SchemaManagerFunctionalTestCase::testEscapedDefaultValueMustBePreserved()`
rather than to test only a single specific platform.

It is now possible to use `\` in non-escaped default values for a column,
and it will be automatically escaped for platforms that need it.

Previously this lead to a confusion when diffing actual and expected
schema leading to perpetual out of sync schema.

Before:

```php
/**
 * @ORM\Column(options={"default" = "Foo\\Bar"}))
 */
private $name;

```

After:

```php
/**
 * @ORM\Column(options={"default" = "Foo\Bar"}))
 */
private $name;

```

And the result in database will be a default value exactly as written in
the annotation, that is `Foo\Bar`.

Travis: Test against lowest and dev dependencies

Removed the "OCI8: SQL Queries with Question Marks" section

Enabled testFetchLongBlob() for PDO SQL Server driver

PostgreSQL 10 support

Removed pre-7.1 quirks

Incremental check for coding standards in pull requests

Combine consecutives unsets

Added test case for resource as parameter

Fixes #2917.

Clean up note on query builder setParameter documentation

Clean elses

Refactoring tests

Use Null Coalesce Operator

Improve deprecation wording in `Doctrine\DBAL\Schema\Column#setOptions()`

People that are starting a new project will immediately know what this
is about, but people upgrading doctrine might get a lot of these and
should have a better clue regarding what this is about.

Validate options

People do not need to know that this will be implemented as an
exception.

I am not sure if there is a rationale behind ignoring extra keys like
this. I was under the impression that something might copy options to
platform specific options, thus leaving options in the original array,
knowing they would be ignored anyway. If it is the case, it would be
best to just move them, otherwise, this commit might help troubleshoot
some mapping issues.
I had to fix some tests that wrongly used that options array (maybe
these options were valid at some point?).