Show argument names in function traces

Erlyberly could show the names of function arguments above the values for function arguments in the term tree. Below is a screenshot of annotated records, it might look similar to this.


Module AST is already parsed for record metadata. Finding function argument names would be an expansion of that.

https://github.com/andytill/erlyberly/blob/master/src/main/resources/erlyberly/beam/erlyberly.erl#L172

For example, given the function in `lists`.

```erlang
-spec sublist(List1, Start, Len) -> List2 when
List1 :: [T],
List2 :: [T],
Start :: pos_integer(),
Len :: non_neg_integer(),
T :: term().

sublist(List, S, L) when is_integer(L), L >= 0 ->
```

The function may return something like.

```erlang
{lists, [{sublist,["List","S","L"],...}]}
```

The dialyzer spec can be used but it may not exist. Functions can have multiple clauses. A binding name should be accepted over `_` or a literal e.g. `Index` is more useful than `0` both of which may be present in different function clauses. There are many variations in function clauses, the AST parser should attempt to return something useful but could return a blank if the argument was too complex or long.

If anyone wants to attempt this, post a comment. I can help with the UI for anyone that doesn't want to code java! :D