ObjC++: also index ObjC symbols.

@classes, @protocols, @properties and -methods (and +methods) will now
show up in the locator.

Change-Id: I33f904c456c321fc80b8aba7ff52d5f1207c58be
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

tests/cpplocators/testdata_basic/file1.mm

@@ -0,0 +1,23 @@
+// Copyright header to keep the Qt Insanity Bot happy.
+
+@protocol NSObject
+@end
+
+@interface NSObject<NSObject>
+@end
+
+@protocol MyProtocol <NSObject>
+- (void) someMethod;
+@end
+
+@interface MyClass: NSObject <MyProtocol>
+@end
+
+@implementation MyClass
+- (void) someMethod {}
+@end
+
+@implementation MyClass(MyCategory)
+- (void) anotherMethod;{}
+- (void) anotherMethod:(NSObject*)withAnObject{}
+@end