Cake 4.x Stable

[kyleweishaupt]

Update CakePHP dependency to 4.0 stable. Closes #290

[dereuromark]

FILE: /home/travis/build/FriendsOfCake/CakePdf/src/Pdf/Engine/MpdfEngine.php
--------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
--------------------------------------------------------------------------------
 20 | ERROR | [x] The first expression of a multi-line control structure must
    |       |     be on the line after the opening parenthesis

one cs error

  Line   Pdf/CakePdf.php                                                 
 ------ ---------------------------------------------------------------- 
  958    Static method Cake\Routing\Router::getRequest() invoked with 1  
         parameter, 0 required.                                          
 ------ --------

one phpstan error

and all is green.

[dereuromark]

We will also need to merge master into 4.x later
05aa0bf
then it should be releasable as beta.

[ADmad]

If have taken care of fixing errors reported by static analyzers and adding typhints where possible after this merge.

The CakePdf class has many combined getter/setter methods. Is anyone interested in splitting them into separate methods? If not I can do a beta release.