robin-drexler/override browser shortcuts

## override browser shortcuts
window.addEventListener("keydown", function(e) {
  e.preventDefault(); // seems to be sufficient to prevent most default shortcuts
  // do something, e.g. custom save
});
	window.addEventListener("keydown", function(e) {
	e.preventDefault(); // seems to be sufficient to prevent most default shortcuts
	// do something, e.g. custom save
	});