Remove whitespace generation (#5833)

* Remove whitespace generation and rely on default printing

Changes to printing:
* Add newline after last empty SwitchCase
* Add newlines around block comments if they are non-flow comments or contain newlines

* Fix a few more fixtures

packages/babel-plugin-transform-function-bind/test/fixtures/function-bind/complex-call/expected.js

@@ -1,11 +1,10 @@
 var _context;
 
 import { map, takeWhile, forEach } from "iterlib";
-
 (_context = (_context = (_context = getPlayers(), map).call(_context, function (x) {
   return x.character();
 }), takeWhile).call(_context, function (x) {
   return x.strength > 100;
 }), forEach).call(_context, function (x) {
   return console.log(x);
-});
+});