add editor folds or similar to keep hand crafted formatting intact

### Description

For readability, you sometimes format code in a nicely aligned way, e.g. columnar for operations on a sequence of array elements.

For instance
```
return new Student(
java.lang.String.class.cast( components[ 0 ] ),
java.lang.String.class.cast( components[ 1 ] ),
java.lang.String.class.cast( components[ 2 ] ),
java.time.LocalDate.class.cast( components[ 3 ] )
);
```
This is hard work, even in this wiki editor I am currently using, for lack of a fixed sized font.
Anyhow, if you could keep that formatting intact even with a reformat all over the code, that would be nice.

The start and end tags could look like this: The first to turn reformatting off.
- `//!reformat-`
- `//!reformat+`

complete example
```
//!reformat-
return new Student(
java.lang.String.class.cast( components[ 0 ] ),
java.lang.String.class.cast( components[ 1 ] ),
java.lang.String.class.cast( components[ 2 ] ),
java.time.LocalDate.class.cast( components[ 3 ] )
);
//!reformat+

```

### Use case/motivation

The readability of code is key.

### Related issues

reformatting in general

### Are you willing to submit a pull request?

No

The issue names no files or tests. Start by locating the NetBeans Java editor's reformat entry point and formatter implementation, then determine where marker lines could preserve a selected block; done means reformatting leaves the marked example unchanged, with coverage for the start and end markers.

Written by the indexing model from the issue text.