support double backslashes for Twig controller references

Author: Haehnchen

src/main/java/fr/adrienbrault/idea/symfony2plugin/routing/RouteHelper.java

@@ -155,6 +155,10 @@ public static PsiElement[] getMethodsOnControllerShortcut(@NotNull Project proje
             return new PsiElement[0];
         }
 
+        // escaping
+        // "Foobar\\Test"
+        controllerName = controllerName.replace("\\\\", "\\");
+
         if(controllerName.contains("::")) {
 
             // FooBundle\Controller\BarController::fooBarAction

src/test/java/fr/adrienbrault/idea/symfony2plugin/tests/templating/TwigTemplateGoToDeclarationHandlerTest.java

@@ -171,6 +171,13 @@ public void testThatConstantProvidesNavigation() {
         assertNavigationMatch(TwigFileType.INSTANCE, "{{ constant('CONST<caret>_FOO') }}", PlatformPatterns.psiElement());
     }
 
+    public void testTestControllerActionsProvidesReferences() {
+        assertNavigationMatch(TwigFileType.INSTANCE, "{{ controller('\\FooBundle\\Cont<caret>roller\\FooController::barAction') }}", PlatformPatterns.psiElement(Method.class).withName("barAction"));
+        assertNavigationMatch(TwigFileType.INSTANCE, "{{ controller('\\\\FooBundle\\\\Cont<caret>roller\\\\FooController::barAction') }}", PlatformPatterns.psiElement(Method.class).withName("barAction"));
+        assertNavigationMatch(TwigFileType.INSTANCE, "{{ controller('FooBundle\\Cont<caret>roller\\FooController::barAction') }}", PlatformPatterns.psiElement(Method.class).withName("barAction"));
+        assertNavigationMatch(TwigFileType.INSTANCE, "{{ controller('FooBundle\\\\Cont<caret>roller\\\\FooController::barAction') }}", PlatformPatterns.psiElement(Method.class).withName("barAction"));
+    }
+
     public void testFunctionNavigation() {
         assertNavigationMatch(
             TwigFileType.INSTANCE,