Bug fixes
[2c6493e] Wrap form tab HTML attributes in double quotes (@dimanche-matin)
[0bf1177] Fix how we get the value of a query parameter in the layout template (@javiereguiluz)
[b74f56c] Deprecate the custom CacheWarmer that won't be used in the next version (@javiereguiluz)
[0b60a4c] Change AdminRouterSubscriber::getSymfonyControllerFqcn so it generates relative paths (@pacproduct)
[448072e] [Doc] Clarify that AdminDashboard only works for pretty URLs (@javiereguiluz)