Enforce blank line between variable declaration and usage

[wincent]

As per request here.

In short, if you declare a var, add a line break before using it. This shows order of requirements better.

Some (contrived) examples of correct code:

const thing = getThing();

thing.publish();

const items = getItems();

const reversedItems = items.reverse();

print(reversedItems);

const firstName = 'Jane';
const secondName = 'Smith';

const full name = [firstName, secondName].join(' ');

[wincent]

Corresponding Java logic here.