Feedback in cache:clear

Especially in production it is sometimes critical to know exactly when your cache is cleared or warmed up. Currently cache:clear provides no feedback whats however. As sites get bigger, so become their cache files. Removing old cache files may sometimes even take minutes. Without any feedback from the cache:clear you do not know the current status.

That's why i added more feedback to the cache:clear command that it makes it possible to see when your cache is warmed up and ready to go.