[suggestion] allow remapping of "new"

This is a followup suggestion for #73. Now to instantiate, only standard c# syntax can be used (on right hand of expression):

```csharp
myList = new List<int>();
```

Keyword `new` should be remappable (either as regex or string array) to keep consistency with recently added options to modify syntax of other constructs.

```csharp
// my exotic syntax
myList = -> List<int>();
```