Remove empty lines in some cases

While we let users keep at most one blank line to improve readability of code, there are some cases where we could be a bit more assertive and remove (or add) a blank line.

Here are some initial thoughts for how a rule like this could work. I'm interested in hearing other opinions on the matter.

### statement lists should not start or end with a blank line
```delphi
begin
A;
end;

try
A;
finally
B;
end;
```

### routine declarations should follow and precede a blank line
```delphi
procedure A;
begin
end;

procedure B;
begin
end;

// comments are
// still 'attached'
[SoAreAttributes]
procedure C;
begin
end;

// trailing comments are 'detached'
```

### `type`, `const`, `var`, `threadvar` blocks should not start with a blank line
```delphi
type
A = B;
C = D;

const
A = '';
B = 0;
```