* Closes#3039
* Closes#3043
* Closes#2970
* Closes#3089
* Parser allows trailing semicolons for any kind of semicolon-separated
items:
- let-block statements,
- module statements,
- record declaration statements,
- record update fields,
- record pattern fields,
- named application arguments,
- list literal items,
- list pattern items,
- open statement using/hiding items,
- `syntax iterator` declaration parameters,
- `syntax fixity` declaration parameters.
* Formatter prints trailing semicolons if the items are displayed on
separate lines, removes them if on a single line.
* The formatting of multiline lists is changed to make it consistent
with other semicolon-separated blocks:
```
[
1;
2;
3;
]
```
instead of
```
[ 1
; 2
; 3
]
```
