2.0 RC 1 - new ConfigurationService (#3810)

* use html5 email validation
* remove static cache seed, for compatibility with non default (file based) caches
* added caching ConfigurationService, removed use of doctrine result cache
* simplify configuration API

tests/phpstan.neon

@@ -2867,11 +2867,6 @@ parameters:
             count: 4
             path: Controller/CalendarControllerTest.php
 
-        -
-            message: "#^Cannot call method findOneBy\\(\\) on object\\|null\\.$#"
-            count: 1
-            path: Controller/ControllerBaseTest.php
-
         -
             message: "#^Cannot call method getRepository\\(\\) on object\\|null\\.$#"
             count: 1
@@ -2887,11 +2882,6 @@ parameters:
             count: 1
             path: Controller/ControllerBaseTest.php
 
-        -
-            message: "#^Cannot call method saveConfiguration\\(\\) on object\\|null\\.$#"
-            count: 1
-            path: Controller/ControllerBaseTest.php
-
         -
             message: "#^Method App\\\\Tests\\\\Controller\\\\ControllerBaseTest\\:\\:assert404\\(\\) has no return type specified\\.$#"
             count: 1