`A7-1-5`: Ignore initializers of non-fundamental types

### Affected rules
 - `A7-1-5`

### Description

The rule clearly states that initializers of non-fundamental types are excluded:
> When declaring a variable that is initialized with a function call or initializer of non-fundamental type.

However we currently only exclude `ClassAggregateLiteral`s and function calls.

### Example

```cpp
class Foo { };
Foo f;
...
auto& a = f;
```
