[0.x] Add Fixers for Laravel specific PHPDocs

[Jubeki]

Fixes #1

The Laravel Code Style has the following style throughout the source code, which currently can not be described with PHP-CS-Fixer alone. This PR adds three new custom fixers for the laravel preset, which of course can be added to psr12 or symfony if the user wants to.

The Fixers are mostly copies with changes from the PHP-CS-Fixer Source Code.

Laravel/laravel_phpdoc_alignment

After @param should be two spaces then a type-hint then another two spaces and then the $variable

  /**
   * Here is a description for what the function does
-  * @param string $foo
+  * @param  string  $foo
   * @return string
   */
  public function bar($foo) {}

Laravel/laravel_phpdoc_order

First should be the description after that @param then @return and at last @throws
The default rule phpdoc_order has a different order: description, @param, @throws, @return

  /**
   * Here is a description for what the function does
   * @param string $foo
   * @param  string  $foo
-  * @throws \Exception
   * @return string
+  * @throws \Exception
   */
  public function bar($foo) {}

Laravel/laravel_phpdoc_seperation

Between each group of tags should be an empty line for seperation. @param and @return are always of the same group and are not to be seperated with an empty line.
The default behaviour for phpdoc_seperation is also an empty line between @param and @return.

  /**
   * Here is a description for what the function does
+  *
   * @param string $foo
   * @param  string  $foo
-  *
   * @return string
+  *
   * @throws \Exception
   */
  public function bar($foo) {}

Additional Note:

There is still some Fixers which need to be implemented, e.g. that in the PHPDoc is full quantified class name is used, which also cannot be described by PHP-CS-Fixer alone:
You may take a look at https://github.com/adamwojs/php-cs-fixer-phpdoc-force-fqcn
though the complex type formatting is not tagged yet and there are still some problems with classes which are in the same namespace.

[nunomaduro]

Can you test fix the test suite, and in general adjust the coding style of the pull request? No final classes, no types, etc.

[Jubeki]

I am sorry, but the types are defined in https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/master/src/Fixer/FixerInterface.php and need to be added.

I of course can remove them in PhpdocTagComparator.

[Jubeki]

I will remove the types from the protected and private methods which are not from the interface.