- added deprecation message for non-int return value in Command::execute()
- fixed all core commands to return proper int values
- added proper return type-hint to Command::execute() method in all core Commands
* 4.2:
[Twig] Remove spaces to fix whitespace in tags
[Twig] Replace for-loops with blocks for attributes
fixed CS
[Tests] Change to willThrowException
[Console] fix PHPDoc in Command
Update FileLoaderLoadException.php
Fix wrong calls to clearstatcache
Add Vietnamese translation for validators
Allow running PHPUnit with "xdebug.scream" ON
[VarDumper] Add descriptors tests
[Cache] fix bad optim
[Yaml] detect circular references
[DI] fix reporting bindings on overriden services as unused
[Routing] minor fix or previous PR
