Move System::jsonExit to BaseModule->jsonExit

- This will ensure headers set in BaseModule->run will be carried in jsonExit scenarios
- Deprecate jsonExit() method in Core\System

src/Module/Search/Acl.php

@@ -80,7 +80,7 @@ class Acl extends BaseModule
 			$o = $this->regularContactSearch($request, $type);
 		}
 
-		System::jsonExit($o);
+		$this->jsonExit($o);
 	}
 
 	private function globalContactSearch(array $request): array