Convert '==' to 'Equals' and reverse

This:

``` csharp
var areEqual = a == b;
```

Becomes:

``` csharp
var areEqual = a.Equals(b);
```

Category: `Refactoring`
Severity: `Hidden`
Diagnostic ID: CC0085 (converting `==` to `Equals`)
Diagnostic ID: CC0086 (converting `Equals` to `==`)
