Revert "Added shortcuts for callbacks and debugger"

This reverts commit 2befbc496a0b4fa562a2a6cae308fe10b2955a6a.
opened 2.2
Merge branch 'v2.2' of https://github.com/nette/sandbox into v2.2

Conflicts:
	app/bootstrap.php
	composer.json
Removed dummy text
Merge branch 'master' into v2.2