force blank line above multiple catch, elseif, else

[ofbeaton]

Large catch/elseif/else blocks are hard to read. Let's enforce a blank line above them.

if (blah) {
  somecode();

} elseif (bleh) {
  someothercode();
}

We would need to implement our own sniff for this.

It may possibly trigger warnings in other sniffs (Squiz.WhiteSpace.ControlStructureSpacing.SpacingBeforeClose) if we do it. So we'll need to look at those as well.

It should be able to auto-correct using phpcbf