NEON parser: fixed replacing special keywords for keys&test [Closes #809]

NEON parser will not convert special keywords as true, false, on,.. to special values in keys or array.
In values function special keywords replacement is preserved.

```
parameters:
true: true
```
will be parsed as:

```
parameters{
"true"=> TRUE
}
```

instead of wrong:
```
parameters{
1 => TRUE
}
```